FAULT-SAND COUPLING AND ITS APPLICATION TO HYDROCARBON MIGRATION: A CASE FROM OILFIELD CFD A
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摘要:
断-砂耦合接触关系决定了输导体系有效性及油气分布规律，是目前渤中凹陷西斜坡明下段构造-岩性油气勘探中的关键问题。利用西斜坡曹妃甸A油田多口钻井的录井、测井数据及三维地震资料，确定了断层-砂体的剖面、平面接触关系，并总结出顺向型、侧向型和复合型3种类型断层-砂体油气运移方式。尝试建立了断-砂耦合接触关系半定量描述思路与方法，明确了本区顺向型与侧向型油气运移效率的相对比值约为1.7，在此基础上探讨了断-砂有效接触面积与砂体中油柱高度之间的关系。实践证实，该方法用于判别曹妃甸A油田潜力砂体的油柱高度是可行的，对成熟探区构造-岩性油气勘探具有重要参考意义。
Abstract:The coupling contact relationship between fault and sand reservoir determines the validity of the hydrocarbon migration and transportation system. It is a key problem in shallow oil and gas exploration and evaluation on the western slope of the Bozhong Sag. Based on the logging data from 6 evaluation wells and the 3-D seismic data from the Oilfield CFD A, the connectivity boundaries of reservoir sand bodies and the types of fault-sand coupling contact are studied in this paper. Three types of oil and gas migration systems, namely the forward, lateral and compositeare, classified. Using the quantitative description method for the fault-sand coupling system, it is clear that the relative efficiency of oil and gas forward migration in the shallow sand bodies in this area is about 1.7, compared to the efficiency of lateral migration. On this basis, the quantitative relationship between fault-sand contact area and oil column height is established. Practice has proved that this method is feasible for predicting the oil column height of shallow undrained sand body in similar blocks, and has important significance for reference of the exploration and evaluation of subsequent reservoirs.
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表 1 曹妃甸A油田断层与砂体耦合数据统计表
Table 1. A statistic of fault and sand body couples in Oilfield CFD A
砂体名称 含油气性质 砂体厚
度H/mL1（顺向）/km 顺向运移
效率aL2（侧向）/km 侧向运移
效率bL/km 断-砂有效接
触面积A/m·km油柱高
度h/mA2d-954.6 顶油底水 12.0 0.12 1.70 1.31 1.00 1.51 18.17 21 A2d-1037.6 顶油底水 27.6 2.18 1.70 0.92 1.00 4.63 127.68 41 A3d-921.8 顶油底水 12.7 0.32 1.70 0.38 1.00 0.93 11.78 24 A3d-944.2 顶油底水 22.0 1.82 1.70 1.84 1.00 4.93 108.55 42 A3d-1049.1 顶油底水 26.9 0.57 1.70 1.60 1.00 2.57 69.11 31 A3d-1113.0 顶油底水 10.6 — — 0.81 1.00 0.81 8.59 16 A4d -867.5 顶油底水 4.0 — — 1.51 1.00 1.51 6.04 12 A4d -1018.5 顶油底水 16.0 1.72 1.70 1.87 1.00 4.79 76.70 42 A4d -1050.6 顶油底水 10.1 — — 1.82 1.00 1.82 18.38 28 
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表 2 曹妃甸A油田A5d井断-砂耦合预测与实钻结果对比
Table 2. Prediction of coupled fracture-sand in well A5d in Oilfield CFD A and comparison with actual drilling results
砂体 砂体厚度/m 断-砂接触
长度（顺向）L1/km顺向运
移效率断-砂接触
长度（侧向）L2/km侧向运
移效率断-砂有效接
触面积/m·km油柱高度/m 预测 实钻 预测 实钻 预测 实钻 预测 实钻 预测 实钻 A5d-1 10.0 5.9 2.22 2.22 1.7 1.51 1.51 1.0 52.84 31.18 28.6 5.5 A5d-2 8.0 5.3 0.79 0.79 1.7 0.93 0.93 1.0 18.18 12.05 21.5 11.3 A5d-3 25.0 21.2 1.17 1.17 1.7 1.04 1.04 1.0 75.73 64.21 33.3 27.9 A5d-4 10.0 7.1 1.84 1.84 1.7 0.92 0.92 1.0 40.48 28.74 26.1 20.4 A5d-5 11.0 9.7 1.38 1.38 1.7 0.45 0.45 1.0 41.76 36.82 26.3 31.0
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