碎屑岩储层地质历史时期孔隙度演化恢复方法——以济阳坳陷东营凹陷沙河街组四段上亚段为例

doi:10.7623/syxb201306008

石油学报 ›› 2013, Vol. 34 ›› Issue (6): 1100-1111.DOI: 10.7623/syxb201306008

碎屑岩储层地质历史时期孔隙度演化恢复方法——以济阳坳陷东营凹陷沙河街组四段上亚段为例

王艳忠¹, 操应长¹, 葸克来¹, 宋国奇², 刘惠民²

1. 中国石油大学地球科学与技术学院山东青岛 266580;
2. 中国石油化工股份有限公司胜利油田分公司地质科学研究院山东东营 257015

收稿日期:2013-05-09 修回日期:2013-08-02 出版日期:2013-11-25 发布日期:2013-10-13
通讯作者: 王艳忠
作者简介:王艳忠，男，1980年10月生，2004年获中国石油大学（华东）学士学位，2010年获中国石油大学（华东）博士学位，现为中国石油大学（华东）地球科学与技术学院副教授，主要从事沉积学及油气储层地质学教学与研究工作。Email：wangyanzhong1980@163.com
基金资助:
国家自然科学基金重点项目（No.U1262203）、国家自然科学基金项目（No.41102058）、国家重大科技专项（2011ZX05006-003）和中央高校基本科研业务费专项资金（12CX04001A）资助。

A recovery method for porosity evolution of clastic reservoirs with geological time：a case study from the upper submember of Es₄ in the Dongying depression, Jiyang Subbasin

WANG Yanzhong¹, CAO Yingchang¹, XI Kelai¹, SONG Guoqi², LIU Huimin²

1. School of Geosciences, China University of Petroleum, Qingdao 266580, China;
2. Geological Scientific Research Institute of Sinopec Shengli Oilfield Company, Dongying 257015, China

Received:2013-05-09 Revised:2013-08-02 Online:2013-11-25 Published:2013-10-13

摘要/Abstract

摘要：

中深层碎屑岩储层孔隙度演化史和烃源岩生排烃史的匹配关系是控制油气富集的关键，但是中深层碎屑岩储层在埋藏过程中多经历复杂的成岩作用改造，孔隙度演化复杂，导致地质历史时期储层孔隙度恢复极其困难。以济阳坳陷东营凹陷民丰洼陷北带沙河街组四段上亚段中深层近岸水下扇扇中亚相含砾砂岩、砂岩储层为研究对象，确定储层胶结-溶解序列和成岩流体性质演化序列以及各成岩作用发生的地质时间及其相应的古埋深，而后拟合储层铸体薄片面孔率-显孔隙度函数关系，利用铸体薄片求取各类次生溶孔、自生矿物对储层的增（减）孔量贡献值，进行胶结-溶解序列约束下的孔隙度反演回剥；同时，根据不同类型岩石的正常压实图版，对反演回剥的孔隙度进行机械压实与热压实校正，恢复储层实际孔隙度，从而建立地质历史时期碎屑岩储层实际孔隙度演化曲线。利用该方法恢复的储层孔隙度演化史与烃源岩生排烃史相结合，能够为中深层碎屑岩储层油气富集区的预测提供指导。

关键词: 孔隙度演化, 成岩流体, 储层, 碎屑岩, 东营凹陷

Abstract:

A matching relationship between porosity evolution history of clastic reservoirs with mid-deep burial (>3 500 m) and hydrocarbon expulsion history of source rocks is the key control over hydrocarbon accumulations, especially for a deeply-buried clastic reservoir that has experienced complex reforms of diagenesis with geological time, therefore, its porosity evolution is so complicated that real porosity recovery of reservoir with geological time is of great difficulty. Taking pebbled sandstones and sandstone reservoirs in the middle fan subfacies of deep nearshore subsea aprons in the upper part of the fourth member of the Shahejie Formation (Es₄^s) in the northern zone of the Minfeng sag in the Dongying depression as an example, diagenetic cementation-dissolution sequences and evolutionary sequences of diagenetic fluid properties of a reservoir, as well as occurrence time of each diagenesis and corresponding palaeoburial depth of the reservoir were determined. Then a functional relationship between plane porosity of casting thin sections and apparent porosity of the reservoir was fitted and positive or negative contribution of various secondary pores and authigenic minerals to variations in reservoir porosity was calculated using casting thin sections, and porosity inversion and back stripping with a constraint of cementation-dissolution sequences were carried out. Meanwhile, according to a normal compaction chart of different types of rocks, the inversed and back-tripped porosity was calibrated by mechanical compaction and thermal compaction in order to reconstruct a real porosity of the reservoir and establish its real porosity-evolution curve versus geological time (or palaeoburial depth). The combination of the reservoir porosity evolutionary history obtained by this method with hydrocarbon generating and expulsing history of source rocks can provide practical guidance for prediction of mid-deep buried clastic reservoirs in hydrocarbon enrichment areas.

Key words: porosity evolution, diagenetic fluid, reservoir,clastic rock, Dongying depression

中图分类号:

TE112.2

王艳忠, 操应长, 葸克来, 宋国奇, 刘惠民. 碎屑岩储层地质历史时期孔隙度演化恢复方法——以济阳坳陷东营凹陷沙河街组四段上亚段为例[J]. 石油学报, 2013, 34(6): 1100-1111.

WANG Yanzhong, CAO Yingchang, XI Kelai, SONG Guoqi, LIU Huimin. A recovery method for porosity evolution of clastic reservoirs with geological time：a case study from the upper submember of Es₄ in the Dongying depression, Jiyang Subbasin[J]. ACTA PETROLEI SINICA, 2013, 34(6): 1100-1111.

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碎屑岩储层地质历史时期孔隙度演化恢复方法——以济阳坳陷东营凹陷沙河街组四段上亚段为例

A recovery method for porosity evolution of clastic reservoirs with geological time：a case study from the upper submember of Es₄ in the Dongying depression, Jiyang Subbasin

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碎屑岩储层地质历史时期孔隙度演化恢复方法——以济阳坳陷东营凹陷沙河街组四段上亚段为例

A recovery method for porosity evolution of clastic reservoirs with geological time：a case study from the upper submember of Es4 in the Dongying depression, Jiyang Subbasin

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A recovery method for porosity evolution of clastic reservoirs with geological time：a case study from the upper submember of Es₄ in the Dongying depression, Jiyang Subbasin