东营凹陷北带古近系碎屑岩储层长石溶蚀作用及其物性响应

doi:10.7623/syxb201305006

石油学报 ›› 2013, Vol. 34 ›› Issue (5): 853-866.DOI: 10.7623/syxb201305006

东营凹陷北带古近系碎屑岩储层长石溶蚀作用及其物性响应

远光辉, 操应长, 葸克来, 王艳忠, 李晓艳, 杨田

中国石油大学地球科学与技术学院山东青岛 266555

收稿日期:2013-03-28 修回日期:2013-06-08 出版日期:2013-09-25 发布日期:2013-08-01
通讯作者: 远光辉
作者简介:远光辉,男,1986年10月生,2009年获中国石油大学(华东)资源勘查工程专业学士学位,现为中国石油大学(华东)博士研究生,主要从事储层地质学方面的学习与研究。Email:youisland@163.com
基金资助:
国家自然科学联合基金重点项目(No.U1262203);国家自然科学基金项目(No.40972080,No.41102058);国家重大科技专项(2011ZX05006-003);中国石油大学(华东)自主创新科研计划项目(12CX06003A,12CX04001A)和中国石油大学(华东)优秀博士学位论文培育计划项目资助。

Feldspar dissolution and its impact on physical properties of Paleogene clastic reservoirs in the northern slope zone of the Dongying sag

YUAN Guanghui, CAO Yingchang, XI Kelai, WANG Yanzhong, LI Xiaoyan, YANG Tian

School of Geosciences & Technology, China University of Petroleum, Qingdao 266555, China

Received:2013-03-28 Revised:2013-06-08 Online:2013-09-25 Published:2013-08-01

摘要/Abstract

摘要：

长石溶蚀作用是东营凹陷北带古近系沙河街组四段—三段中亚段碎屑岩储层成岩过程中重要的成岩事件。储层中长石颗粒次生溶孔普遍存在,镜下微观特征表明长石溶蚀越强烈,溶蚀产物越富集,因此,长石溶蚀能否有效改善其储层物性值得商榷。以普通和铸体薄片为基础,利用人-机交互图像分析技术,通过面积百分含量法,精确统计了长石溶蚀量和溶蚀产物含量;结合储层物性、流体包裹体及储层孔隙结构等资料,系统分析了长石溶蚀作用和溶蚀产物特征、长石溶蚀成岩环境及长石溶蚀对储层物性的影响。研究表明,东营凹陷北带沙河街组四段—三段中亚段储层中,长石溶蚀作用发生在相对封闭的高温成岩环境中,由于流体在孔隙网格系统中的流动速度低,且高温条件下长石溶蚀速度较快,因此,长石溶蚀产物并不能被有效带出溶蚀区或进行长距离搬运,而是在原地或准原地发生沉淀,即长石溶蚀只是将孔隙结构较好的原生孔隙进行重新分配,转换为基本等量的长石颗粒次生溶孔和高岭石(伊利石)晶间孔的过程;长石溶蚀后储层孔隙度变化不大,但孔隙结构变差,渗透率降低。

关键词: 物性响应, 长石溶蚀作用, 溶蚀产物, 封闭成岩环境, 东营凹陷

Abstract:

Feldspar dissolution is an important diagenetic event in the diagenesis of Es₄-middle part of Es₃ clastic reservoirs in the northern slope zone of the Dongying sag. Secondary dissolved pores of feldspar grains are almost ubiquitous in clastic reservoirs, however, microscopic investigations indicate that the stronger the feldspar dissolution, the richer the dissolution products, thus, whether physical property of a reservoir can be effectively improved though feldspar dissolution remains debatable. Based on matched thin sections and molded thin sections, we accurately counted amounts of both feldspar dissolution and dissolution products of rock thin sections using area percent method and human-computer interaction image analysis technique. Combined with reservoir property, liquid-inclusion testing and pore structure data matched with rock thin sections, we systematically analyzed characteristics of feldspar dissolution and dissolution products, diagenetic environment of feldspar dissolution and its impact on physical properties of Es₄-middle part of Es₃ clastic reservoirs in the northern slope zone, Dongying sag. The result showed that feldspar dissolution in the studied reservoirs occurred in a relatively closed and high-temperature diagenetic environment, dissolution products could not be effectively brought out the dissolved area or moved in a long distance due to a low speed of fluids in the pore network system and a quicker dissolution of feldspars under high temperatures, instead, they precipitated only in situ or almost in situ. In other words, feldspar dissolution just transformed primary intergranular pores with better pore structures to secondary pores of feldspar grains with an almost identical volume but poorer pore structures as well as to kaolinite (illite) intercrystal pores. Before and after dissolution, reservoir porosity changed little, but reservoir structure became poorer after dissolution and so was reservoir permeability.

Key words: physical property response, feldspar dissolution, dissolution product, closed diagenetic environment, Dongying sag

中图分类号:

TE112.21

远光辉, 操应长, 葸克来, 王艳忠, 李晓艳, 杨田. 东营凹陷北带古近系碎屑岩储层长石溶蚀作用及其物性响应[J]. 石油学报, 2013, 34(5): 853-866.

YUAN Guanghui, CAO Yingchang, XI Kelai, WANG Yanzhong, LI Xiaoyan, YANG Tian. Feldspar dissolution and its impact on physical properties of Paleogene clastic reservoirs in the northern slope zone of the Dongying sag[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(5): 853-866.

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东营凹陷北带古近系碎屑岩储层长石溶蚀作用及其物性响应

Feldspar dissolution and its impact on physical properties of Paleogene clastic reservoirs in the northern slope zone of the Dongying sag

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