Paleopressure evolution and its effects on diagenesis of reservoirs in middle-deep Paleogene strata in Baxian sag, Jizhong depression

doi:10.7623/syxb201405006

ACTA PETROLEI SINICA ›› 2014, Vol. 35 ›› Issue (5): 867-878.DOI: 10.7623/syxb201405006

• Petroleum Exploration • Previous Articles Next Articles

Paleopressure evolution and its effects on diagenesis of reservoirs in middle-deep Paleogene strata in Baxian sag, Jizhong depression

Xi Kelai¹, Cao Yingchang¹, Jin Jiehua¹, Zhao Xianzheng², Su Rui², Jin Fengming², Cui Zhouqi², Zhou Lei¹, Zhang Huina¹

1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
2. PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China

Received:2014-03-06 Revised:2014-07-22 Online:2014-09-25 Published:2014-08-05

冀中坳陷霸县凹陷古近系中深层古地层压力演化及对储层成岩作用的影响

葸克来¹, 操应长¹, 金杰华¹, 赵贤正², 苏芮², 金凤鸣², 崔周旗², 周磊¹, 张会娜¹

1. 中国石油大学地球科学与技术学院山东青岛 266580;
2. 中国石油华北油田公司河北任丘 062552

通讯作者: 操应长，男，1969年1月生，1992年获石油大学（华东）沉积地质学专业学士学位，2003年获中国科学院广州地球化学研究所博士学位，现为中国石油大学（华东）教授、博士生导师，主要从事沉积学、层序地层学及油气储层地质学方面的研究工作。Email：cyc8391680@163.com
作者简介:葸克来，男，1988年8月生，2010年获中国石油大学（华东）地质学专业学士学位，现为中国石油大学（华东）地质学专业博士研究生，主要从事油气储层地质学方面的研究工作。Email：kelai06016202@163.com
基金资助:
国家自然科学基金石油化工联合基金重点项目（U1262203）、国家重大科技专项（2011ZX05009-003）及中央高校基本科研业务费专项资金项目（14CX06013A）资助。

Abstract

Abstract:

This study reconstructed the process of paleopressure evolution and investigated its effects on diagenesis of reservoirs in middle-deep Paleogene strata in Baxian sag, on the basis of present-day pressure analysis through a combination of detection logging, oil testing, experimental analysis of test data, and basin modeling. Results showed that the pressure in middle-deep Paleogene strata experienced two stages, primary accumulation and reduction of overpressure, showing low-high-low evolutionary characteristics. Formation pressure was generally normal during initial deposition, whereas overpressure began to develop around 40 Ma ago and peaked during 25-20 Ma as strong overpressure. Formation pressure continuously declined thereafter and evolved to the present-day normal pressure and low overpressure, with moderate overpressure developed in localized regions. Uncompaction caused by rapid burial in the early stage was the primary cause of abnormal overpressure while hydrocarbon generation in the late stage had no significant effect on formation pressure. Paleopressure inhibited diagenesis of reservoirs in middle-deep Paleogene strata from the following aspects: (1) It inhibited compaction and thus protected primary pores of the reservoir; (2) It inhibited transformation of clay minerals and reduced ion sources such as Ca²⁺, delaying cementation and thus protecting pores of the reservoir; and (3) It restrained organic acid generation and hindered fluid seepage as well as material exchange, unfavorable for feldspar dissolution.

Key words: Paleopressure, diagenesis, basin modeling, fluid inclusions, Paleogene strata, Baxian sag

摘要：

综合运用测录井、试油和实验分析测试资料及盆地模拟方法，在霸县凹陷古近系中深层今地层压力分析的基础上，恢复了古地层压力的演化过程，探讨了古地层压力对储层成岩作用的影响。分析结果表明，古近系中深层地层压力存在超压原始积累—超压降低2个阶段，其演化表现出“低—高—低”变化特征。沉积初期地层压力以常压为主，在距今约40 Ma开始发育超压，约25~20 Ma期间超压达到最高值，表现为强超压，随后地层压力持续降低，至今演化为常压、弱超压，局部地区发育中超压。早期快速埋藏导致的欠压实作用是地层超压形成的主要原因，而后期生烃增压作用不明显。古地层超压抑制了储层的成岩作用，具体表现为：①抑制压实作用的进行，从而保护储层的原生孔隙；②抑制黏土矿物的转化，减少Ca²⁺等的来源，从而减弱胶结作用发生，保护储层的孔隙；③抑制有机酸的生成，阻碍流体渗流与物质交换，从而不利于长石溶蚀作用的发生。

关键词: 古地层压力, 成岩作用, 盆地模拟, 流体包裹体, 古近系, 霸县凹陷

CLC Number:

TE112.2

Xi Kelai, Cao Yingchang, Jin Jiehua, Zhao Xianzheng, Su Rui, Jin Fengming, Cui Zhouqi, Zhou Lei, Zhang Huina. Paleopressure evolution and its effects on diagenesis of reservoirs in middle-deep Paleogene strata in Baxian sag, Jizhong depression[J]. ACTA PETROLEI SINICA, 2014, 35(5): 867-878.

葸克来, 操应长, 金杰华, 赵贤正, 苏芮, 金凤鸣, 崔周旗, 周磊, 张会娜. 冀中坳陷霸县凹陷古近系中深层古地层压力演化及对储层成岩作用的影响[J]. 石油学报, 2014, 35(5): 867-878.

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Paleopressure evolution and its effects on diagenesis of reservoirs in middle-deep Paleogene strata in Baxian sag, Jizhong depression

冀中坳陷霸县凹陷古近系中深层古地层压力演化及对储层成岩作用的影响

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