渤海湾盆地渤中坳陷储层超压特征与成因机制

刘晓峰; 解习农; 张成

渤海湾盆地渤中坳陷储层超压特征与成因机制

中国地质大学资源学院, 湖北武汉 430074

基金项目:

国家自然科学重点基金项目 40238059

国家自然科学基金青年科学基金项目 40402014

详细信息

作者简介:
刘晓峰(1970-), 男, 副教授, 博士, 主要从事盆地流体分析和成藏动力学研究.E-mail: xfliu@cug.edu.cn

中图分类号: P618
计量
- 文章访问数: 3405
- HTML全文浏览量: 95
- PDF下载量: 52
- 被引次数: 0
出版历程
- 收稿日期: 2008-02-25
- 刊出日期: 2008-05-25

Characteristics and Generation of the Reservoir Overpressure in Bozhong Depression, Bohai Bay Basin

Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 对储层超压的分析, 有助于理解渤中坳陷油气晚期快速成藏机理.利用RFT实测储层压力资料分析了渤中坳陷储层超压的特征和成因.渤中坳陷存在3套储层超压系统: 浅层明化镇组-馆陶组储层超压系统、中层东营组-沙河街组-孔店组储层超压系统、基底(中生界及以下地层) 储层超压系统.渤中坳陷的储层超压可能主要是由3种机制综合引起的, 即不均衡压实作用、超压传递作用和裂解气的生成作用.少量保存的传递超压是深部超压流体注入的“化石”, 它是超压背景下油气快速充注成藏的结果.
- 储层超压 /
- 传递超压 /
- 裂解气 /
- 快速成藏 /
- 渤中坳陷
Abstract: The analysis of fluid migration and rapid hydrocarbon accumulation is essential for exploring distribution of overpressure and probing into its generaion.Based on the RFT of many drills in Bozhong depression, the characteristics and generation of reservoir overpressure have been discussed in this paper.Three reservoir overpressure systems have been identified in the Bozhong depression: an upper reservoir overpressure in Guantao Formation-Minghuazhen Formation, a middle reservoir overpressure in Dongying Formation-Shahejie Formation-Kongdian Formation, and a lower reservoir overpressure in base (Pre-Cenozoic).Detailed investigation of reservoir overpressure in the Bozhong depression shows that overpressure probably is the result of a combination of following three mechanisms: mechanical compaction disequilibrium, overpressure transference and thermal cracking.Transfer overpressure maybe is common in subsurface reservoirs, but recognizable transfer overpressures are infrequent.A few transfer overpressures preserved in reservoirs at shallower depths named "overpressure fluid fossil", resulted from deeper overpressured fluid charging, helps us to understand the rapid petroleum accumulation in overpressured sedimentary basins.
- reservoir overpressure /
- transfer overpressure /
- thermal cracking /
- rapid petroleum accumulation /
- Bozhong depression

HTML全文

图 1 渤中坳陷各地层单元储层压力-深度图

OP.超压; Tr-OP.传递超压; UP.低压; TOP.超压顶界面; BOP.超压底界面; Phy.静水压力梯度; Pr.静岩压力梯度

Fig. 1. Plots of pressure vs. depth for different stratigraphic units in Bozhong depression

下载: 全尺寸图片幻灯片

图 2 渤中坳陷BZ1311井泥岩和砂岩声波时差-深度图

NC.正常压实; UC.欠压实; TUC.欠压实顶界; BUC.欠压实底界; T.D..完钻深度; 1.泥岩的声波时差; 2.砂岩的声波时差; 3.试油实测的储层流体压力系数

Fig. 2. Interval travel time vs. depth for mudstone and sandstone respectively in the well BZ1311

下载: 全尺寸图片幻灯片

图 3 渤中坳陷QHD324井(a) 和PL2561井(b) 压力-深度图

Fig. 3. Plots of pressure vs. depth for well QHD324 (a) and PL2561 (b) in Bozhong depression

下载: 全尺寸图片幻灯片

参考文献(19)

[1]	Barker, C., 1990. Calculated volume and pressure changes during the thermal cracking of oil to gas in reservoirs. AAPG Bulletin, 74: 1254-1261.
[2]	Gong, Z. S., 2004. Neotectonics and petroleum accumulation in offshore China basins. Earth Science—Journal of China University of Geosciences, 29 (5): 513-517 (in Chinese with English abstract).
[3]	Gong, Z. S., Wang, G. C., 2001. Neotectonism and late hydrocarbon accumulation in Bohai Sea. Acta Petrolei Sinica, 22 (2): 1-7 (in Chinese with English abstract).
[4]	Gong, Z. S., Wang, G. C., He, Q., 2000. The Neogene: A main realm of hydrocarbon exploration in Bozhong sag and its surrounding areas. China Offshore Oil and Gas (Geology), 14 (3): 145-156 (in Chinese with English abstract).
[5]	Grauls, D. J., Baleix, J, M., 1994. Role of overpressures and in situ: Stresses in fault-controlled hydrocarbon migration—A case study. Marine and Petroleum Geology, 11: 734-742. doi: 10.1016/0264-8172(94)90026-4
[6]	Hao, F., Cai, D. S., Zou, H. Y., et al., 2004. Overpressuretectonic activity controlled fluid flow and rapid petroleum accumulation in Bozhong depression, Bohai Bay Basin. Earth Science—Journal of China University of Geosciences, 29 (5): 518-524 (in Chinese with English abstract).
[7]	Law, B. E., Dickinson, W. W., 1985. Conceptual model for origin of abnormally pressured gas accumulations in low-permeability reservoirs. AAPG Bulletin, 69: 1295-1304.
[8]	Liu, X. F., Xie, X. N., 2001. Overpressure relief and its implication to hydrocarbon migration and accumulation. Geological Science and Technology Information, 20 (4): 51-56 (in Chinese with English abstract).
[9]	Liu, X. F., Xie, X. N., 2003. Review on formation mechanism of the reservoir overpressure fluid system. Geological Science and Technology Information, 22 (3): 55-60 (in Chinese with English abstract).
[10]	Magara, K., 1978. Compaction and fluid migration: Practical petroleum geology. Elsevier Scientific Publishing Company, New York, 1-313.
[11]	Mi, L. J., 2001. The neotectonism and major Neogene oil and gas fields in Bohai Sea. China Offshore Oil and Gas (Geology), 15 (1): 21-28 (in Chinese with English abstract).
[12]	Osborne, M. J., Swarbrick, R. E., 1997. Mechanisms for generating overpressure in sedimentary basins: A reevaluation. AAPG Bulletin, 81 (6): 1023-1041.
[13]	龚再升, 2004. 中国近海含油气盆地新构造运动与油气成藏. 地球科学——中国地质大学学报, 29 (5): 513-517. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200405001.htm
[14]	龚再升, 王国纯, 2001. 渤海新构造运动控制晚期油气成藏. 石油学报, 22 (2): 1-7. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB200102000.htm
[15]	龚再升, 王国纯, 贺清, 2000. 上第三系是渤中坳陷及其周围油气勘探的主要领域. 中国海上油气(地质), 14 (3): 145-156. https://www.cnki.com.cn/Article/CJFDTOTAL-ZHSD200003000.htm
[16]	郝芳, 蔡东升, 邹华耀, 等, 2004. 渤中坳陷超压-构造活动联控型流体流动与油气快速成藏. 地球科学——中国地质大学学报, 29 (5): 518-524. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200405002.htm
[17]	刘晓峰, 解习农, 2001. 超压释放及其对油气运移和聚集的意义. 地质科技情报, 20 (4): 51-56. doi: 10.3969/j.issn.1000-7849.2001.04.011
[18]	刘晓峰, 解习农, 2003. 储层超压流体系统的成因机制述评. 地质科技情报, 22 (3): 55-60. doi: 10.3969/j.issn.1000-7849.2003.03.011
[19]	米立军, 2001. 新构造运动与渤海海域上第三系大型油气田. 中国海上油气(地质), 15 (1): 21-28. doi: 10.3969/j.issn.1673-1506.2001.01.007