辽东湾地区孔隙演化的机理

蒋恕; 蔡东升; 朱筱敏; 朱光辉; 胡孝林

辽东湾地区孔隙演化的机理

蒋恕^{1, 2,},
蔡东升³,
朱筱敏²,
朱光辉¹,
胡孝林¹

1.
中海石油研究中心, 北京 100027
2.
中国石油大学资源与信息学院, 北京 102249
3.
中海石油有限公司湛江分公司, 广州湛江 524057

基金项目:

国家科技攻关计划 SC04TJ-TQL-001

详细信息

作者简介:
蒋恕(1976-), 男, 博士, 现在中海石油研究中心博士后工作站从事石油地质研究.E-mail: jiangshu@cnooc.com.cn

中图分类号: P618.130.2
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出版历程
- 收稿日期: 2006-09-26
- 刊出日期: 2007-05-25

Mechanism of the Pore Evolution in Liaodong Bay Area

1.
CNOOC Research, Beijing 100027, China
2.
Faculty of Natural Resources and Information Technology, China University of Petroleum, Beijing 102249, China
3.
CNOOC China Ltd. Zhanjiang Branch, Zhanjiang 524057, China

摘要

摘要: 孔隙演化机理对研究中深层储层控制因素、预测中深层有利储层及中深层隐蔽油气藏勘探具有重大意义.通过辽东湾地区的辽中凹陷、辽西凸起及辽西凹陷孔隙演化分析表明, 辽东湾地区凹陷和凸起的孔隙演化阶段是一致的, 即在总体降低的背景中存在4个次生孔隙发育带, 所不同的是凹陷的次生孔隙发育带相对凸起深, 次生孔隙发育带与成岩演化、有机质的演化、粘土矿物的转化、超压、油气的早期充注密切相关.探讨了孔隙演化过程中孔隙度降低和次生孔隙发育的机理, 认为辽东湾地区4个次生孔隙发育带的形成主要源于有机酸对碳酸盐胶结物、长石、岩屑的溶蚀以及超压和早期油气充注对孔隙的保护.
- 辽东湾地区 /
- 孔隙演化 /
- 次生孔隙 /
- 演化机理 /
- 成岩 /
- 有机质演化 /
- 早期油气充注 /
- 超压
Abstract: The mechanism of pore evolution is significant to the research of deeper reservoir controlling factors, predicting the favorable reservoir and subtle reservoirs exploration in middle-deep strata.The pore evolution analysis of Liaozhong sag, Liaoxi uplift and Liaoxi sag in Liaodong Bay area were analyzed, which indicates that there are four similar secondary pore zones during the whole porosity reduction current background in different sags and uplifts.The only difference is that the depth of secondary pore development in sag is deeper than that in the uplift, and the secondary pore zone is related to the diagenesis, organic evolution, clay mineral evolution, overpressure and early oil and gas injection.This paper discusses the mechanism of the porosity loss and the secondary pores development, and the emphasis is placed on the analysis of the relation among the pore evolution, diagenesis, organic evolution, clay mineral evolution, early oil and gas injection and overpressure.On the basis of the discussion, it is pointed out that the formation of the four sencondary pore development zones is due to the dissolution of the carbonate cement, feldspar and the clastic debris by the organic acid, and the protection from the overpressure and the early oil and gas injection.
- Liaodong Bay area /
- pore evolution /
- secondary pore /
- evolution mechanism /
- diagenesis /
- organic evolution /
- early oil and gas injection /
- overpressure

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图 1 辽东湾地区构造单元划分

Fig. 1. Structural units of the Liaodong Bay area

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图 2 辽中凹陷孔隙演化与成岩演化、粘土演化、R_o演化、压力演化关系

a.孔隙演化图; b.渗透率演化图; c.粘土含量演化图; d.R_o演化; e.压力演化

Fig. 2. Relation graph among the porosity evolution, diagenesis evolution, clay evolution, R_o evolution and pressure evolution in Liaozhong sag

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图 3 孔隙度演化的控制因素

a.JZ23-1-1, 1567.56m, 早成岩A期原生孔隙发育; b.JZ23-1-1, 12358.04m, 晚成岩A期次生孔隙发育带, 原生+次生孔隙; c.LD27-2-2, 2112.41m, 压实使孔隙度降低; d.JX1-1-1, 2923.10m, 方解石形成于石英加大后, 方解石胶抑制石英加大; e.DL27-2-2, 2327.51m, 方解石胶结交代, 并有溶蚀作用; f.JX1-1-13244m, 粒内溶蚀; g, h.DL22-1-1井2514m处早期烃类包裹体

Fig. 3. Factors controlling porosity evolution

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图 4 辽西凸起孔隙演化、成岩演化、R_o演化和埋藏史关系

a.孔隙度演化图; b.R_o演化; c.油气分布与埋藏史关系

Fig. 4. Relation graph among the porosity evolution, diagenesis evolution, R_o evolution, oil distribution and burial history in Liaoxi uplift

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图 5 辽中凹陷高岭石含量与孔隙度交汇图

Fig. 5. Crossplot of the kaolinite content and the pores in Liaozhong depression

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