1. Single layer characteristic spectrogram

Single layer characteristic spectrum of the second member of Shahejie Formation (1)

The second member of Shahejie Formation in Xia 32 block is divided into seven sand groups I-VII from top to bottom, and the characteristic spectrum of each single layer is shown in Figure 6- 1 1 and Figure 6- 12.

There is no single well production in sand formation ⅰ. Sand group II is divided into two sand layers: sand layer II 1 Xia 32-only102; There are only 1 single well in Ⅱ 2 sand layer, that is, well Xia 32- 104. ⅲ sand group is divided into four sand layers, all of which have no single production wells. Ⅳ sand group is divided into two sand layers; Ⅳ1sand layer has no single well production; There are only 1 single well in Ⅳ 2 sand layer, that is, well Xia 32-x 106. ⅴ sand group is divided into five sand layers: ⅴ 1, ⅴ2, ⅴ3 and ⅴ5 sand groups have no development wells; ⅴ 4 sand group has only 1 single well Xia 32-x6, and it is also the only 1 development well.

ⅵ sand group is divided into five sand layers: ⅵ 1 and ⅵ 2, all of which have no single production wells; ⅵ 5 There are only 1 single well, namely well Xia 32-x45; ⅵ 4 has two single wells, Xia 32-x2 and Xia 32-30. Two wells were sampled and analyzed twice in April and July, 2000. In April 2000, the crude oils of the two wells were similar in composition, both of which were n-alkanes and isoparaffins. However, in July 2000, the samples from the two wells were slightly different. Firstly, the content of saturated hydrocarbon in crude oil of well Xia 32-30 is high, while the content of saturated hydrocarbon in crude oil of well Xia 32-x2 is low. Secondly, the isoparaffins in the crude oil of the two wells are slightly different. Therefore, the principle of selecting the characteristic spectrum of ⅵ 4 sand layer is the closest to that of commingled production wells.

ⅵ 3 sand layer can be subdivided into two sub-layers. There are four single wells in the subzone, namely, Well Xia 32-8, Well Xia 32-33, Well Xia 32-x37 and Well Xia 32-x44. /kloc-0. crude oil samples were collected from these four wells in August, 1999, and the samples of well Xia 32-x37 were analyzed again in June, 2000. The crude oil chromatograms of Xia 32-8 and Xia 32-33 in August 1999 are almost the same, and the crude oil chromatograms of Xia 32-x37 in August 1999 are basically the same, but the crude oil chromatograms of Xia 32-x44 are quite different, and the content of saturated hydrocarbon light fraction is obviously high. From the analysis of reservoir numerical simulation results, it is found that the oil saturation of well Xia 32-x44 is high, while the other three wells are greatly affected by injected water, and the saturated hydrocarbon is slightly reduced due to the influence of injected water. From the analysis of two samples taken from well Xia 32-x37, the difference is also obvious, that is, the content of saturated hydrocarbon light fraction in crude oil samples increased obviously in June 2000 +00, which is related to V1sand layer in the second member of Shahejie Formation in May 2000. Therefore, the chromatogram of well Xia 32-x44 should be taken as the characteristic chromatogram of the small layer.

There are two single production wells in the subzone, namely Xia 32-47 well and Xia 32-49x well. Although the sampling time of crude oil in the two wells is different, their spectrograms are almost the same. The crude oil spectrum of well Xia 32-49x is selected as the characteristic spectrum of the small layer. ]]

1, ⅶ 3 and ⅶ 4 have no single well production; There are only 1 single well in sand layer ⅶ 2, but no crude oil samples are taken.

(2) Characteristic spectrum of the upper single layer of Shahejie Formation.

The upper third member of Shahejie Formation in Xia 32 block is divided into five sand groups from top to bottom. Sand group I is divided into 7 sand layers: I1,I 4, I 5 and I 6 sand layers have no single well; There are 1 single well in sand layers Ⅰ 3 and Ⅰ 7, which are Xia 32- 12 and Xia 32-x9 respectively. There are three single wells in Ⅰ 2 sand layer, namely Xia 32-x3, Xia 32-24 and Xia 32-40. Well Xia 32-x3 was sampled and analyzed in April 2000 and June 65438+10 respectively, and the spectrograms were basically consistent. The crude oil spectra of well Xia 32-24 1999 65438+ 10 are obviously different from those in August. The former has higher light saturated hydrocarbon content, while the latter has lower light saturated hydrocarbon content. The situation of well Xia 32-40 is similar to that of well Xia 32-24, that is, in June 1 999-June1sample, the content of saturated hydrocarbon light fraction was high, while in July 2000, the content of saturated hydrocarbon light fraction was low. Through the chromatographic comparison of crude oil from two wells, it is found that the composition of isoparaffin has not changed much, so the one near the commingled production well can be selected as the characteristic spectrum.

Fig. 6- Characteristic Spectrum of Each Layer of the Second Member of Shahejie Formation in Xia 32 Block (I).

Fig. 6- 12 Characteristic Spectrum of Each Layer of the Second Member of Shahejie Formation in Xia 32 Block (II)

Sand group Ⅱ is divided into four sand layers, in which there are five single wells in Ⅱ 1, Ⅱ 3 and Ⅱ 4, and only1well in Ⅱ 2, namely Xia 32-X505. ⅲ sand group is divided into five sand layers, all of which have no single production wells. Sand group Ⅳ is divided into four sand layers: Ⅳ1,Ⅳ 3 and Ⅳ 4 all have no single wells; Only Ⅳ 2 has 1 single well, that is, well Xia 327. There are no single wells in the six sand layers of ⅴ sand group.

2. Variation law of composition plane of single-layer crude oil

Compared with the crude oil of Shahejie Formation and Shahejie Formation, the overall composition characteristics of crude oil in well Xia 32-704 are similar, and the results of two sampling analysis of this well are almost the same, indicating that the composition of single-layer crude oil is stable.

There are three single wells in the Ⅰ 2 sand layer of the third member of Shahejie Formation, namely Xia 32-x3, Xia 32-24 and Xia 32-40. The hydrocarbon composition of the three wells is basically the same, but the similarity between Xia 32-40 and Xia 32-24 is high, which is slightly different from Xia 32-x3 located in the high part of the structure. This phenomenon may be related to the change of lateral composition caused by crude oil filling process. Although this change is small, it still exists today.

Well Xia 32-8, Well Xia 32-33, Well Xia 32-x37 and Well Xia 32-x44 are the wells in the second member of Shahejie Formation, among which the hydrocarbon composition of crude oil in the first three wells is almost the same, only Well Xia 32-x44 is slightly different, which is related to the lateral composition change caused by the above crude oil filling process. In addition, this phenomenon also exists in the crude oil of Well Xia 32-30 and Well Xia 32-x2, which exploit the ⅳ sand layer of the second member of Shahejie Formation.

See attached figure 6- 13 for the characteristic spectrum of each single layer of the third member of Shahejie Formation in Xia 32 block.

The second is the single-layer crude oil production of the second member of Shahejie Formation.

There are many oil-bearing strata in Xia 32 block. Except for well Xia 32-704, the production horizons of other wells are the upper third member of Shahejie Formation and the second member of Shahejie Formation. Therefore, this section mainly studies the single-layer crude oil production of the upper third member of Shahejie Formation and the second member of Shahejie Formation.

1. The second member commingled production well of Shahejie Formation

The samples were taken from 8 wells in the second member of Shahejie Formation in Xia 32 block. There are 4 commingled production wells in two layers, namely, well Xia 32-7, well Xia 32-22, well Xia 32-23 and well Xia 32- 109. There are two three-layer commingled production wells, namely Xia 32- 14 and Xia 32-204. There are two four-layer commingled production wells, namely Xia 32-x46 and Xia 32-203.

2. Single-layer crude oil output of two-layer commingled production wells in the second member of Shahejie Formation

(1) Well Xia 32-7

Well Xia 32-7 is a combined production well of the second member of Shahejie Formation and the ⅵ sand layer. The four single wells are Xia 32-47 and Xia 32-x49 respectively, and their hydrocarbon compositions are similar. Well Xia 32-x49 near Well Xia 32-7 is selected as the representative well of sand layer. Single wells in ⅵ 4 sand layer include Xia 32-x2 and Xia 32-30 wells. According to the chromatographic characteristics, well Xia 32-30 is close to well Xia 32-7, but the distance between well Xia 32-30 and well Xia 32-x2 is close to that of well Xia 32-7, so well Xia 32-30 is selected as the representative well of ⅵ 4 sand layer (Table 6- 1 1, Table 6-65438

Table 6- 1 1 Xia 32-7 Well Crude Oil Single Layer Production Calculation Characteristic Fingerprint Compound Ratio

Table 6- 12 Calculation Results of Single Layer Crude Oil Production of Well Xia 32-7

Fig. 6- 13 Characteristic Spectrum of Each Layer of the Third Member of Shahejie Formation in Xia 32 Block

(2) Well Xia 32-23

This well is composed of sand layers ⅵ 4 and ⅵ 5 of the second member of Shahejie Formation. ⅵ Four single wells include Well Xia 32-x2 and Well Xia 32-30, with Well Xia 32-x2 as the representative. Well ⅵ 5 is Xia 32-x45. From the comparison of chromatographic macro-characteristics, the crude oil content before ⅵ5 c 1 1 in Xia 32-X45 single well is less, which may be caused by water washing, indicating that the ⅵ 5 sand layer of this well has been flooded. However, before C 1 1, the composition of commingled production wells was higher, which was similar to that of hydrocarbons in layer ⅵ 4. See table 6- 13 for the quantitative calculation results.

Table 6- 13 Calculation Results of Single Layer Crude Oil Contribution of Combined Production Wells in Xia 32 Block

In July 1999, the average daily oil production of this well was 6.8t, and the water cut was 50.5%. By April 2000, the average daily oil production was 5t, and the water cut was 85.6%. According to analysis, water mainly comes from ⅵ 5 sand layer. According to the analysis and sampling results of well Xia 32-x45 in July and June, 2000 10, the content of light hydrocarbons (before C 1 1) decreased rapidly, and the degree of water washing increased. It is suggested to block the ⅵ 5 sand layer of well Xia 32-23.

(3) Well Xia 32- 109

This well is a combination of ⅴ 1 and ⅴ 2 sand layers in the second member of Shahejie Formation, and there is no single well production. April 2000 12, with a daily oil production of 6.0t and a water cut of 6 1.3%. No measures were proposed.

(4) Well Xia 32-22

This well is composed of ⅶ 1 and ⅶ 2 sand layers. ⅶ 1 sand layer has no single production well, and ⅶ 2 sand layer has single production well Xia 32-4 1. The crude oil chromatogram of well Xia 32-22 is very similar to that of well Xia 32-4 1, and it is a single well with sand layer VII. ⅶ 2 sand layer may be the main producing layer of well Xia 32-22.

On April, 2000 12, the daily oil production of this well was 8.3 tons, and the water cut was 89.3%. No measures were proposed.

3. Single-layer crude oil output of three-layer and above commingled production wells in the second member of Shahejie Formation

(1) Well Xia 32- 14

This well is the combined production of ⅵ 3 and ⅵ 4 sand layers in the second member of Shahejie Formation. Well Xia 32-x44 is a single well of ⅵ 3 sand layer in the second member of Shahejie Formation. The production wells of ⅵ 4 sand layer are Xia 32-x2 well and Xia 32-30 well. Taking well Xia 32-x2 as an example, the relative contributions of the two layers are calculated (Table 6- 13).

The ultraviolet absorption curve of well Xia 32- 14 is similar to that of sand layer ⅵ 3, which may indicate that well Xia 32- 14 is dominated by sand layer ⅵ 3 of the second member of Shahejie Formation, supplemented by sand layer ⅵ 4. The average daily oil production of this well1999 in July was 4.4t, and the water cut was 86.6%. In April 2000 12, the daily oil production was 4.2t, and the water cut was 87.0%. No measures have been proposed at present.

(2) Well Xia 32-204

This well is a combined production of sand layers ⅵ 2, ⅵ 4 and ⅵ 5. There are wells Xia 32- 10 1, Xia 32-8, Xia 32-33, Xia 32-x37 and Xia 32-x44 in the sand layer, with Xia 32-33 as the representative. There are well Xia 32-47 and well Xia 32-49 x for sand layer combined production, and well Xia 32-49 x is selected as the representative. ⅵ 4 and ⅵ 5 are one layer, with Xia 32-23 as the representative well. See table 6- 13 for the calculation results.

Although the ⅵ 4 sand layer of well Xia 32-x2 still produces oil, according to the results of reservoir numerical simulation, the oil saturation of well Xia 32-204 is very low, so it may not produce oil any more. It is suggested to plug ⅵ 4 sand layer.

From the crude oil chromatographic comparison results of Well Xia 32-49x () and Well Xia 32-x44 (), the difference between them is obvious, so it is not suitable to treat them as one layer. Therefore, the actual oil producing zones of well Xia 32-204 are ⅵ 2 and ⅵ 5. According to quantitative calculation and analysis, well Xia 32-204 is mainly produced in sand layer.

(3) Well Xia 32-203

This well combines ⅴ 1, ⅴ 2, ⅴ 3 and ⅴ 4 sands in the second member of Shahejie Formation. There is no single well production in ⅴ 1, ⅴ 2 and ⅴ 3 sand layers, but now only ⅴ 4 sand layer has single well production, that is, Xia 32-X6 well.

The crude oil chromatogram of Ⅴ 4 sand layer of well Xia 32-x6 is obviously different from that of well Xia 32-203, which may be due to the long distance between well Xia 32-x6 and well Xia 32-203, or because the Ⅴ 4 sand layer of well Xia 32-203 is not the main producing layer.

Well Xia 32-203 has low oil saturation and tongue-shaped edge water. The average daily oil production of this well1999 in July was 4.8t, and the water cut was 75.5%. By April 12, 2000, there was no oil output. This well can be converted to injection.

(4) Well Xia 32-x46

The sand layers ⅵ 2, ⅵ 4 and ⅵ 5 of the second member of Shahejie Formation in this well are jointly produced. ⅵ 2 sand layer has no single well production. Well Xia 32- 10 1, Well Xia 32-8, Well Xia 32-33, Well Xia 32-x37 and Well Xia 32-x44 are single wells in the sand, represented by Well Xia 32-x44. Well Xia 32-x2 and Well Xia 32-30 are single wells in ⅵ 4 sand layer, represented by Well Xia 32-x2. The single well of ⅵ 5 sand layer is Xia 32-x45 well. According to the numerical simulation results, the remaining oil saturation of the ⅵ 2 sand layer in Well Xia 32-x46 is extremely low, and the contribution of this sand layer to Well Xia 32-x46 can be ignored, so Well Xia 32-X46 is approximately regarded as the combined production of other three layers. See table 6- 13 for the calculation results.

From the analysis of ultraviolet absorption curves of the above layers, it can be seen that the pay zone of well Xia 32-x46 should be mainly sand, and the ⅵ 4 sand layer has no contribution.

Judging from the oil-bearing situation, the sand layer near Xia 32-x46 well is the main producing layer, and the ⅵ 4 sand layer is the second, and the ⅵ 5 sand layer has basically no contribution. It is suggested to plug ⅵ 2 sand layer and ⅵ 5 sand layer.

Third, the single-layer crude oil output of commingled production wells in the upper part of Shahejie Formation.

1. Combined production well in the upper member of Shahejie Formation

The samples were taken from 6 wells in the upper part of Shahejie Formation in Xia 32 block. There are 3 commingled production wells in two layers, namely, Well Xia 32-x48, Well Xia 32- 13 and Well Xia 32-508. Two three-layer commingled production wells, well Xia 32-502 and well Xia 32- 1 1; There are only 1 five-layer commingled production wells in Xia 32-35 well.

2. Single-layer crude oil production of two-layer commingled production wells

(1) Well Xia 32-48

In this well, I _ 2 and I _ 3 sand layers were produced in the third member of Shahejie Formation. The single wells of Ⅰ 2 sand layer are Xia 32-x3, Xia 32-24 and Xia 32-40, represented by Xia 32-40. There is no single well in the sand layer, so the sand layer is used to produce single well Xia 32- 12. See table 6- 13 for the calculation results.

The average daily oil production of Well Xia 32-481July 1999 was 7.9 tons, with water cut of 87.5%. In April 2000 12, the daily oil production was 3.4t, and the water cut was 82.7%. Water may mainly come from. It is recommended to close the sand layer.

(2) Well Xia 32- 13

This well combines Ⅱ1and Ⅱ 2 sand layers in the third member of Shahejie Formation. There is no single well in Ⅱ1sand layer, and the single well in Ⅱ 2 sand layer is Xia 32-505. The chromatogram of well Xia 32- 13 is very similar to that of well Xia 32-505, which is only produced from Ⅱ 2 sand layer. It is speculated that the crude oil of well Xia 32- 13 is mainly produced from Ⅱ 2 sand layer. However, due to the long distance between Well Xia 32-505 and Well Xia 32- 13, the reliability of the prediction results is poor. There are no suggestions at present.

(3) Well Xia 32-508

In this well, the upper Ⅳ 4 member of Shahejie Formation and the middle Ⅱ1sand layer are produced jointly, and there is no single well production in both layers. From the crude oil chromatogram of well Xia 327 with a yield of Ⅳ 2 sand layer, it is obviously different from well Xia 32-508. If there is little difference in crude oil composition between Ⅳ 4 sand layer and Ⅳ 2 sand layer, it can be inferred that well Xia 32-508 mainly produces oil in II1sand layer in Sha 3. There are no suggestions at present.

3. Single-layer crude oil production of commingled production wells with three or more layers

(1) Well Xia 32-502

Well I-7 is located in the third member of Shahejie Formation, and it is produced in combination with sand layers. The single well in Ⅰ 7 sand layer is Xia 32-x9, but there is no single well in sand layer, and the single well in Ⅱ 2 sand layer is Xia 32-505. Through qualitative comparison, it is inferred that the main oil producing layer of well Xia 32-502 is Ⅰ 7 sand layer, followed by sand layer and sand layer.

On April, 2000 12, the daily oil production of this well was 35.6t, and the water cut was 75.4%. Water may mainly come from sand layer. It is suggested to block the upper sand layer of Shahejie Formation in this well.

(2) Well Xia 32- 1 1 is located above the third member of Shahejie Formation.

Combined mining of sand layer and Ⅳ 2 sand layer. There is no single well in the sand layer. The single well of Ⅳ 2 sand layer is well Xia 327. The crude oil chromatogram of well Xia 32- 1 1 is basically the same as that of well Xia 327. It is speculated that the main contributor to Xia 32- 1 1 well is Ⅳ 2 sand layer. In July 1999, the average daily oil production of this well was 7.4 t, and the water cut was 84%. No measures have been proposed at present.

(3) Well Xia 32-35

This well has produced five layers of Ⅱ1,,,Ⅲ 2 sand layers in the upper third member of Shahejie Formation. At present, only Xia 32-505 sand layer has single production wells, and other layers have no single production wells.

1July 1999, the daily oil production of this well was 8.0t, and the water cut was 9 1.5%. No measures have been proposed at present.