顺北东部北东向走滑断裂体系控储控藏作用与突破意义

doi:10.3969/j.issn.1672-7703.2021.03.004

摘要/Abstract

摘要： 顺北地区区域断裂体系具有“东西分区”的特点，作为东西部断裂体系之间起转换作用的顺北1号、顺北5号断裂带，北东向顺北1号断裂带平面以拉分段、平移段为主，单井控制规模大；北西向顺北5号断裂带为南北对接形成，其中北段北西向断裂带平面以挤压为主，单井控制规模相对较小。通过对北东向断裂体系顺北4号、顺北8号、顺北12号断裂带解析，认为其平面具有典型“三段式”分段特征，断裂活动强度大，储集体整体规模可能较大，同时其走向与现今区域主应力方向一致，其分段内部储集体连通性好，且东部发育盆地—中外缓坡相原地优质烃源岩，相比北西向断裂体系，其成储与成藏条件更为优越。基于上述认识优选部署顺北42X井、顺北41X井、顺北8X井，测试均获千吨（油当量）高产油气流，新发现一个4～5亿吨级（油当量）资源阵地，进一步证实北东向走滑断裂体系储集体规模大，成藏条件优越，走滑断裂带具有“控储、控圈、控运、控藏、控富”五位一体特征，对中国海相碳酸盐岩走滑断裂带评价具有借鉴意义。

关键词: 顺北, 北东向走滑断裂体系, 断裂控储控藏作用, 五位一体, 塔里木盆地

Abstract: The fault system in Shunbei area has characteristics of “zonation between the east and west” bounded by Shunbei No.1
and No.5 faults, which play a transformation role between the east and west fault systems. On the plane, the NE trending Shunbei
No.1 fault is mainly composed of pull apart segment and translation segment, where the single well controls large area of oil reservoir,while the NW trending Shunbei No.5 fault is jointly formed by north and south segments. The north segment is dominated by compression stress with relatively small-scale oil reservoir controlled by single well. The seismic interpretation of No.4, No.8 and No.12 faults indicates that the NE fault system has a typical “three-segment” feature on the plane, with intensive fault activities and similar strike with the current regional principal stress. The overall reservoir scale is large and reservoir connectivity is good in each segment. In addition, high-quality source rocks of basin-middle and outer gentle slope facies were developed in the eastern Shunbei area. As a whole, the reservoir development and hydrocarbon accumulation conditions are superior than those of the NW fault system. Based on the above understandings, Wells Shunbei 42X, Shunbei 41X and Shunbei 8X were drilled, and high oil and gas flow rates of 1000 tons of oil equivalent obtained during well testing, indicating a new resource position of (400-500)-million-ton-level oil equivalent, which further proved that the NE strike-slip fault system has large reservoir scale, superior hydrocarbon accumulation conditions, and the characteristics of five-in-one “strike-slip fault system controlling the reservoir,trap, hydrocarbon migration, accumulation and enrichment”. The result can be used for reference to evaluate the strike slip fault of marine carbonate rocks in China.

Key words: Shunbei, NE strike-slip fault system, Fault controlling on reservoir and hydrocarbon accumulation, Five-in-one, Tarim Basin

中图分类号:

TE111.2

云露. 顺北东部北东向走滑断裂体系控储控藏作用与突破意义[J]. 中国石油勘探, 2021, 26(3): 41-52.

Yun Lu.

Controlling effect of NE strike slip fault system on reservoir development and hydrocarbon accumulation and its geological significance in the eastern #br# Shunbei area, Tarim Basin [J]. China Petroleum Exploration, 2021, 26(3): 41-52.

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