库车坳陷迪北地区侏罗系致密储层裂缝发育特征及控藏模式

doi:10.7623/syxb2015S2009

石油学报 ›› 2015, Vol. 36 ›› Issue (S2): 102-111.DOI: 10.7623/syxb2015S2009

库车坳陷迪北地区侏罗系致密储层裂缝发育特征及控藏模式

姜振学^1,2, 李峰^1,2,3, 杨海军⁴, 李卓^1,2, 刘洛夫^1,5, 陈磊^1,2, 杜忠明⁶

1. 油气资源与探测国家重点实验室北京 102249;
2. 中国石油大学非常规天然气研究院北京 102249;
3. 中海油研究总院北京 100027;
4. 中国石油塔里木油田公司勘探开发研究院新疆库尔勒 841000;
5. 中国石油大学地球科学学院北京 102249;
6. 中海石油(中国)有限公司深圳分公司广东广州 510240

收稿日期:2015-08-04 修回日期:2015-11-10 发布日期:2016-02-24
通讯作者: 姜振学,男,1963年4月生,1986年获大庆石油学院学士学位,1998年获中国地质大学(北京)博士学位,现为中国石油大学(北京)非常规天然气研究院教授、博士生导师,主要从事常规和非常规油气地质与资源评价研究.Email:jiangzx@cup.edu.cn
基金资助:
国家重点基础研究发展计划(973)项目(2011CB201105)、国家重大科技专项(2011ZX05003-001、2011ZX05008-004)资助.

Development characteristics of fractures in Jurassic tight reservoir in Dibei area of Kuqa depression and its reservoir-controlling mode

Jiang Zhenxue^1,2, Li Feng^1,2,3, Yang Haijun⁴, Li Zhuo^1,2, Liu Luofu^1,5, Chen Lei^1,2, Du Zhongming⁶

1. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;
2. Institute of Unconventional Natural Gas Research, China University of Petroleum, Beijing 102249, China;
3. CNOOC Research Institute, Beijing 100027, China;
4. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Xinjiang Korla 841000, China;
5. College of Geosciences, China University of Petroleum, Beijing 102249, China;
6. Shenzhen Branch, CNOOC China Limited, Guangdong Guangzhou 510240, China

Received:2015-08-04 Revised:2015-11-10 Published:2016-02-24

摘要/Abstract

摘要：

库车坳陷迪北地区侏罗系致密砂岩储层中裂缝普遍发育,裂缝对致密砂岩气藏具有重要控制作用.利用露头、岩心和薄片等资料,明确裂缝发育特征和形成机理,探讨裂缝对致密砂岩气藏的控制作用.结果表明:研究区裂缝主要为构造裂缝,其次为成岩裂缝,构造裂缝较为发育,非均质性强,大部分未被充填,有效性较好.构造裂缝分为3期,分别在喜马拉雅早期、中期和晚期3期构造挤压作用下形成.第3期构造裂缝发育程度最高且基本未被充填,是最重要的一期构造裂缝;其发育期晚于天然气大量充注期,且构造裂缝形成之后天然气仍持续充注.裂缝对侏罗系致密砂岩气藏的控制作用主要表现在:发育在构造低凹或斜坡部位的小开度裂缝,可改善储层物性,有利于形成甜点(迪西1井区);发育在迪北地区构造高部位的大开度裂缝可对致密砂岩气藏进行调整、改造和破坏(依深4井区).

关键词: 裂缝, 致密砂岩气藏, 控藏模式, 侏罗系, 迪北地区, 库车坳陷

Abstract:

Fractures are widely developed in Jurassic tight sandstone reservoir in Dibei area of Kuqa depression, which has an important control effect on tight sandstone gas reservoir. The outcrop, core, thin section, and other data are used to identify characteristics and forming mechanism of fractures, and examine control of fractures on the tight sandstone gas reservoir. The results show that in the study area, the majority are structural fractures, followed by diagenetic fractures. The structural fractures are developed with strong heterogeneity, and mostly unfilled, showing better efficiency. They are formed under the tectonic compression in early, middle and late Himalayan period, respectively. In the third period, the structural fractures are extremely developed, not filled basically, and considered as the most important ones. Their development period is later than natural gas charging period; charging of natural gas was continuous after formation of structural fractures. Control of fractures on the Jurassic tight sandstone gas reservoir is mainly reflected in the following aspects:(1) The small-aperture fracture developed in the tectonic depression and slope can improve reservoir physical properties, which is favorable to formation of sweet spots (Well Dixi-1). (2) The large-aperture fractures developed in the structural high point in Dibei area can adjust, transform and damage tight sandstone gas reservoir (Well Yishen-4).

Key words: fracture, tight sandstone gas reservoir, reservoir-controlling mode, Jurassic, Dibei area, Kuqa depression

中图分类号:

TE122

姜振学, 李峰, 杨海军, 李卓, 刘洛夫, 陈磊, 杜忠明. 库车坳陷迪北地区侏罗系致密储层裂缝发育特征及控藏模式[J]. 石油学报, 2015, 36(S2): 102-111.

Jiang Zhenxue, Li Feng, Yang Haijun, Li Zhuo, Liu Luofu, Chen Lei, Du Zhongming. Development characteristics of fractures in Jurassic tight reservoir in Dibei area of Kuqa depression and its reservoir-controlling mode[J]. Acta Petrolei Sinica, 2015, 36(S2): 102-111.

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库车坳陷迪北地区侏罗系致密储层裂缝发育特征及控藏模式

Development characteristics of fractures in Jurassic tight reservoir in Dibei area of Kuqa depression and its reservoir-controlling mode

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