渤海湾盆地渤南洼陷沙河街组三段剩余压力梯度与油气分布关系

doi:10.11743/ogg20200518

Abstract

Abstract:

In order to quantify and characterize the relationship of overpressure with hydrocarbon migration, accumulation and distribution, we took the 3rd member of the Shahejie Formation in the Bonan Sag of the Bohai Bay Basin as an example to study the excess pressure gradient and its variation patterns as well as its influence on hydrocarbon distribution based on fluid pressure prediction and through analyses of logging, geophysical and testing data.The results show that the hydrocarbon-bearing third member is generally over pressurized with the deep sag zone having greater excess pressure and the highest gradient, the steep slope and step-fault zones having moderate excess pressure and gradient, and the gentle slope zone having smaller excess pressure and the lowest gradient.The hydrocarbon migration dynamics and reservoiring capacity of a location in the member are determined by its distance to the overpressure center.For locations right in the overpressure center, the hydrocarbon migration is under strong driving forces, high excess pressure gradients are mainly distributed near faults, and oil and gas mainly accumulate near the Boshen 4 fault; for locations adjacent to the overpressure center where high excess pressure gradient mainly appears in highly heterogeneous formations, oil and gas migrate to areas with low excess pressure gradient through sandbodies with various lateral transport capacities; and for locations far away from the overpressure center, the excess pressure is relatively low and buoyancy stands out as the main driving force for oil and gas migration, and the relationship between the excess pressure gradient and the oil and gas distribution is no longer obvious.

Key words: overpressure, excess pressure gradient, excess pressure, hydrocarbon distribution, the 3rd member of Shahejie Formation, Bonan Sag, Bohai Bay Basin

CLC Number:

TE122.3

Hua Liu, Jun Li, Yuelin Feng, Xuefeng Hao, Hongmei Lin, Feifei Yuan. Relationship between excess pressure gradient and hydrocarbon distribution in the 3rd member of Shahejie Formation in Bonan Sag, Bohai Bay Basin[J]. Oil & Gas Geology, 2020, 41(5): 1083-1091.

Figures/Tables 9

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Table 1

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井号	构造带	实测压力/ MPa	等效深度法		伊顿法
井号	构造带	实测压力/ MPa	预测压力/ MPa	相对误差/ %	预测压力/ MPa	相对误差/ %
罗21	缓坡带	22.76	24.32	6.85	24.82	9.05
义126	缓坡带	40.02	41.55	3.82	40.37	0.87
罗17	缓坡带	30.60	30.26	-1.11	29.93	-2.19
义74	缓坡带	31.03	27.13	-12.57	23.41	-24.56
义107	陡坡带	36.25	38.49	6.18	33.16	-8.52
义283	陡坡带	42.35	43.21	2.03	43.85	3.54
义285	陡坡带	48.14	51.23	6.42	36.15	-24.91
义282	陡坡带	53.68	57.98	8.01	29.67	-44.73
义102	断阶带	39.26	41.58	5.91	39.59	0.84
义67	断阶带	61.45	46.23	-24.77	55.76	-9.26
义79	断阶带	27.13	36.58	34.83	34.16	25.91
义17	断阶带	55.73	46.23	-17.05	62.79	12.67
义173	断阶带	44.78	36.45	-18.60	46.72	4.33
义83	断阶带	51.63	52.38	1.45	50.41	-2.36
义77	断阶带	46.23	33.74	-27.02	49.58	7.25
渤深8	深洼带	42.79	50.46	17.92	42.15	-1.50
渤深5	深洼带	66.59	55.13	-17.21	63.15	-5.17
义123	深洼带	67.26	70.63	5.01	69.84	3.84
义80	深洼带	36.25	35.46	-2.18	36.45	0.55
义121	深洼带	65.13	60.28	-7.45	66.93	2.76

置信度	A级	B级	C级	D级	E级	F级
录井显示	饱含油	富含油	油浸	油斑	油迹	荧光
分值/m^-1	0.95	0.75	0.50	0.40	0.05	0.01

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Relationship between excess pressure gradient and hydrocarbon distribution in the 3rd member of Shahejie Formation in Bonan Sag, Bohai Bay Basin

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