鄂尔多斯盆地延长组裂缝特征及其控藏作用

doi:10.7657/XJPG20230504

新疆石油地质 ›› 2023, Vol. 44 ›› Issue (5): 535-542.doi: 10.7657/XJPG20230504

鄂尔多斯盆地延长组裂缝特征及其控藏作用

肖正录¹(), 路俊刚¹(), 李勇¹, 张海², 尹相东¹, 周翔¹

1.西南石油大学 a.油气藏地质及开发工程全国重点实验室；b.天然气地质四川省重点实验室；c.地球科学与技术学院，成都 610500
2.延长油田股份有限公司靖边采油厂，陕西延安 716000

收稿日期:2023-04-11 修回日期:2023-06-16 出版日期:2023-10-01 发布日期:2023-09-25
通讯作者: 路俊刚（1980-），男，山东潍坊人，教授，博士生导师，油气地球化学，（Tel）13618084430（E-mail）lujungang21@sohu.com
作者简介:肖正录（1994-），男，甘肃武威人，讲师，博士，油气地球化学，（Tel）15709357897（E-mail）xiaozl@163.com
基金资助:
国家自然科学基金(42072185);国家自然科学基金(42002176)

Characteristics of Fractures and Their Controls on Yanchang Formation Reservoir in Ordos Basin

XIAO Zhenglu¹(), LU Jungang¹(), LI Yong¹, ZHANG Hai², YIN Xiangdong¹, ZHOU Xiang¹

1. Southwest Petroleum University, a.National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; b.Sichuan Key Laboratory of Natural Gas Geology; c.School of Geoscience and Technology, Chengdu, Sichuan 610500, China
2. Jingbian Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan’an, Shaanxi 716000, China

Received:2023-04-11 Revised:2023-06-16 Online:2023-10-01 Published:2023-09-25

摘要/Abstract

摘要：

为确定断裂发育区油气充注聚集在时间上的持续性和在空间上的有序性，以鄂尔多斯盆地南缘上畛子—转角地区为例，分析裂缝形成期次与油藏分布的关系，探讨裂缝对延长组油藏的控制作用。研究表明，延长组主要发育燕山运动期二幕、燕山运动期三幕和喜马拉雅运动期共3期裂缝，不同期次裂缝对油气运聚的作用不同。近源油藏捕获了烃源岩从低熟到成熟阶段的所有产物，在燕山运动期三幕和喜马拉雅运动期遭到破坏，原油向远源区调整。研究区南部靠近渭北隆起，其裂缝的纵向连通性及砂体发育程度较强，原油在远源储集层中富集；研究区北部原油主要滞留在近源储集层中。因此，裂缝与砂体对接形成的输导网络，可以对油藏起到调整作用，在多期次裂缝的沟通下，近源和远源油藏的资源量立体互补。

关键词: 鄂尔多斯盆地, 延长组, 裂缝, 油气成藏, 控藏机制, 差异聚集, 次生调整

Abstract:

In order to determine the temporal continuity and spatial orderliness of hydrocarbon charging and accumulation in fault areas, taking the Shangzhenzi farm-Zhuanjiao area at the southern margin of the Ordos basin as an example, the relationship between fracture formation period and reservoir distribution was analyzed, and the controls of fractures on Yanchang formation reservoir was discussed. The study shows that the fractures of three periods (Yanshanian movement episode II and III, and Himalayan movement) are developed in Yanchang formation, showing varying impacts on hydrocarbon migration and accumulation. Near-source oil reservoirs captured all the hydrocarbons generated from the source rocks in immature and mature stages, which were subsequently destroyed during the Yanshanian episode III and the Himalayan movement, leading to oil migration towards the areas far away from source rocks. In the southern part of the study area, close to the Weibei uplift, fractures are well connected longitudinally and sand bodies are well developed, allowing oil enrichment primarily in reservoirs far away from source rocks. In the northern part of the study area, oil is predominantly retained in reservoirs near source rocks. Consequently, fractures and sand bodies are connected to form a transport network that plays a role in adjusting reservoirs. By virtue of multi-stage fractures, resources in reservoirs near or far away from source rocks can be complemented and integrated.

Key words: Ordos basin, Yanchang formation, fracture, hydrocarbon accumulation, reservoir-controlling mechanism, differential accumula-tion, secondary adjustment

中图分类号:

TE122

肖正录, 路俊刚, 李勇, 张海, 尹相东, 周翔. 鄂尔多斯盆地延长组裂缝特征及其控藏作用[J]. 新疆石油地质, 2023, 44(5): 535-542.

XIAO Zhenglu, LU Jungang, LI Yong, ZHANG Hai, YIN Xiangdong, ZHOU Xiang. Characteristics of Fractures and Their Controls on Yanchang Formation Reservoir in Ordos Basin[J]. Xinjiang Petroleum Geology, 2023, 44(5): 535-542.

图/表 7

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鄂尔多斯盆地延长组裂缝特征及其控藏作用

Characteristics of Fractures and Their Controls on Yanchang Formation Reservoir in Ordos Basin

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