辽西凸起斜坡区风化壳油气运移特征及控藏作用

李虹霖; 郭涛; 张如才; 杨传超; 张明升

doi:10.19509/j.cnki.dzkq.2022.0130

辽西凸起斜坡区风化壳油气运移特征及控藏作用

doi: 10.19509/j.cnki.dzkq.2022.0130

中海石油(中国)有限公司天津分公司, 天津 300459

基金项目:

中海石油(中国)有限公司"七年行动计划"重大科技专项课题"渤海油田上产4 000万t新领域勘探关键技术" CNOOC-KJ135ZDXM36TJ08TJ

详细信息

作者简介:
李虹霖(1989-), 男, 工程师, 主要从事油气勘探综合研究工作。E-mail: lihl56@cnooc.com.cn

中图分类号: P618.13
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- 文章访问数: 551
- PDF下载量: 233
- 被引次数: 0
出版历程
- 收稿日期: 2021-08-18
- 网络出版日期: 2022-09-07

Hydrocarbon migration characteristics and its controlling effect on hydrocarbon accumulation of weathering crust in slope area of Liaoxi Uplift

Tianjin Branch of CNOOC Ltd., Tianjin 300459, China

摘要

摘要:
随着勘探程度的提高, 小型复杂断块圈闭已成为当前凸起区油气勘探的重点领域, 为了明确辽西凸起断块圈闭油气差异富集的原因, 利用三维地震、测录井、薄片等数据资料, 通过三维流线定量模拟的方法, 分析凸起斜坡区潜山顶面风化壳特征, 建立"壳-断"耦合油气运移模式, 刻画斜坡区油气优势运移路径, 从而明确风化壳运移对凸起断块油气差异富集的控制作用。结果表明: ①研究区潜山历经多期构造运动, 且潜山岩性主要为下古生界碳酸盐岩和太古界花岗岩, 岩性性质较脆, 易被风化剥蚀, 风化壳溶蚀孔隙及构造裂缝普遍发育, 且分布稳定, 形成斜坡区油气侧向长距离运移的主要通道; ②斜坡中带受反向断层控制形成断隆构造, 油气沿风化壳的运移受斜坡断隆带遮挡, 形成"壳-断"耦合油气运移模式, 断隆带断距大小控制风化壳油气侧向运移能力; ③利用三维流线定量模拟的方法, 刻画出研究区四级油气优势运移通道, 明确不同级别油气运移通道对凸起断块油气富集程度的控制作用。该研究成果有效指导辽西凸起油气勘探实践, 并填补了富油凹陷成熟凸起区油气成藏认识及研究方法。
- 风化壳 /
- 断隆带 /
- "壳-断"耦合运移 /
- 油气运移 /
- 斜坡区 /
- 辽西凸起
Abstract:
With the improvement of the exploration degree, small complex fault block traps have become the key field of oil and gas exploration in the current uplift area. To clarify the reasons for the differential enrichment of oil and gas in the fault block trap in the West Liaoning uplift, the characteristics of weathering crust on the top of the buried hill in the uplift slope area are analysed by using three-dimensional seismic, logging, thin section and other data through three-dimensional streamline quantitative simulation. The "crust-fault" coupling migration model is established to describe the dominant migration path of oil and gas in the slope area to clarify the control effect of hydrocarbon migration along weathered crust on the differential enrichment of oil and gas in the convex fault block. The results show that ① the buried hill in the study area has experienced multistage tectonic movements, and the lithology of the buried hill is mainly lower Paleozoic carbonate rock and Archean granite. The lithology is brittle and easily weathered and denuded. The denudation pores and structural fractures of the weathering crust are widely developed and stably distributed, forming the main channel of lateral long-distance migration of oil and gas in the slope area. ② The middle zone of the slope is controlled by reverse faults to forma fault uplift structure. The migration of oil and gas along the weathering crust is blocked by the slope fault uplift zone, forming a "crust-fault" coupling oil and gas migration model. The fault throw of the fault uplift zone controls the lateral migration ability of oil and gas in the weathering crust. ③ Using the method of three-dimensional streamline quantitative simulation, the four-level dominant oil and gas migration channels in the study area are characterized, and the control effect of different levels of oil and gas migration channels on the degree of oil and gas enrichment in convex fault blocks is clarified. The research results effectively guide the practice of oil and gas exploration in the Liaoxi Uplift and fill the gap of the understanding and research method of oil and gas accumulation in mature uplift areas of oil-rich sags.
- weathering crust /
- fault uplift belt /
- "crust-fault" coupling migration /
- hydrocarbon migration /
- slope area /
- Liaoxi Uplift

HTML全文

图 1 研究区区域位置及构造纲要图(剖面见区域位置图AB)

T₂.新近系底界；T₃.东三段底界；T₅.古近系底界；T₈.沙二段底界；T₃^M.东二段底界；下同

Figure 1. Regional location and structure of the research area

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图 2 潜山风化壳岩心及镜下薄片观察

Figure 2. Observation of weathering crust core and microscopic thin section of buried hill

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图 3 潜山风化壳曲率及蚂蚁体追踪属性分布

Figure 3. Curvature of weathering crust of buried hill and attribute distribution of Ant-tracking

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图 4 “壳-断”耦合油气运移机制

Figure 4. "Crust-fault" coupling oil and gas migration mechanism

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图 5 “壳-断”耦合油气成藏模式

Figure 5. "Crust-fault" coupling hydrocarbon accumulation model

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图 6 研究区三维油气运聚模拟及优势运移通道划分

Figure 6. Three dimensional simulation of oil and gas migration and accumulation and division of dominant migration channels in the study area

下载: 全尺寸图片幻灯片

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