冀中坳陷束鹿凹陷泥灰岩-砾岩致密油气成藏特征与勘探潜力

doi:10.7623/syxb201404001

石油学报 ›› 2014, Vol. 35 ›› Issue (4): 613-622.DOI: 10.7623/syxb201404001

• 地质勘探 • 下一篇

冀中坳陷束鹿凹陷泥灰岩-砾岩致密油气成藏特征与勘探潜力

赵贤正¹, 朱洁琼², 张锐锋³, 鱼占文², 王吉茂², 郭永军²

1. 中国石油华北油田公司河北任丘 062552;
2. 中国石油华北油田公司勘探开发研究院河北任丘 062552;
3. 中国石油华北油田公司勘探部河北任丘 062552

收稿日期:2014-02-26 修回日期:2014-04-25 出版日期:2014-07-25 发布日期:2014-08-05
通讯作者: 赵贤正，男，1962年10月生，1986年获华东石油学院学士学位，2005年获中国石油大学（北京）博士学位，现任中国石油华北油田公司副总经理、教授级高级工程师，李四光地质科学奖、孙越崎能源大奖获得者，主要从事油气勘探研究和管理工作。Email：xzzhao@petrochina.com.cn
作者简介:赵贤正，男，1962年10月生，1986年获华东石油学院学士学位，2005年获中国石油大学（北京）博士学位，现任中国石油华北油田公司副总经理、教授级高级工程师，李四光地质科学奖、孙越崎能源大奖获得者，主要从事油气勘探研究和管理工作。Email：xzzhao@petrochina.com.cn
基金资助:
中国石油天然气股份有限公司重大科技专项“华北油田上产稳产800万吨关键技术与应用”（2014E-35）资助。

Characteristics and exploration potential of tight calcilutite-rudstone reservoirs in Shulu sag, Jizhong depression, North China

Zhao Xianzheng¹, Zhu Jieqiong², Zhang Ruifeng³, Yu Zhanwen², Wang Jimao², Guo Yongjun²

1. PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China;
2. Exploration & Development Research Institute, PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China;
3. Exploration Department of PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China

Received:2014-02-26 Revised:2014-04-25 Online:2014-07-25 Published:2014-08-05

摘要/Abstract

摘要：

渤海湾盆地冀中坳陷束鹿凹陷泥灰岩-砾岩油藏是一种特殊的致密油气藏。基于束探1H井对泥灰岩-砾岩油藏勘探的突破，重新分析了该区泥灰岩发育的构造背景、沉积环境及地层层序特征。进一步结合钻井、测井和分析化验等资料对束鹿凹陷泥灰岩的生油能力、储集性能、成藏机理、油藏特征重新进行评价，取得一些新的认识：1束鹿凹陷泥灰岩作为烃源岩，具有有机碳含量高、有机质类型好（以Ⅱ₁型为主）、转化率高、排烃能力强等特征，为优质烃源岩；2泥灰岩因构造应力发育一些构造缝，作为烃源岩（当中包含的有机质）发生降解排烃产生的有机质孔隙、有机酸溶蚀碳酸盐岩产生的溶蚀孔隙、降解排烃中产生的异常压力缝等孔洞（缝）形成了泥灰岩的孔喉系统并充当了烃类的储集空间及渗流通道，所以泥灰岩具有储集性能；3包裹在泥灰岩中的砾岩存在欠压实作用，储集空间相对好于泥灰岩，砾岩的储集空间主要为粒间孔、粒内溶孔、贴粒缝、构造缝等孔缝。因此，泥灰岩是一种源-储一体的、特殊的“自生自储”连续致密油藏，而夹杂在泥灰岩中的碳酸盐岩质砾岩为源-储共生的岩性致密油藏。2种油藏类型均具有特低孔特低渗、非均质性强、压力系数高、产量递减快的特点。同时，利用成因法（氯仿沥青“A”法）探索束鹿凹陷泥灰岩致密油气资源量，对烃源岩总生油量的分配情况进行初步研究，发现束鹿凹陷致密油资源量丰富，勘探潜力较大，并给出束鹿凹陷砾岩-泥灰岩的勘探方向和建议。

关键词: 渤海湾盆地, 束鹿凹陷, 泥灰岩-砾岩, 成藏机理, 源-储一体油藏特征, 勘探潜力, 沙河街组三段下亚段

Abstract:

Calcilutite-rudstone reservoirs are unique tight reservoirs in Shulu sag, Jizhong depression, North China. This study re-analyzed the tectonic setting, depositional environments, and stratigraphic sequence characteristics of calcilutite development in Shulu sag based on the latest breakthrough of calcilutite-rudstone reservoir exploitation in Well ST1H. Further, the characteristics of calcilutite reservoir regarding oil generation capacity, reservoir property, and accumulation mechanism are re-assessed by a combination of drilling, well logging, and laboratory tests, in order to gain new understanding. In Shulu sag, calcilutite provides high-quality source rocks with high organic carbon content, good organic matter type (mainly Ⅱ₁ type), high conversion rate, and strong expulsion ability. Due to tectonic stress, natural fractures are well developed within calcilutite. The organic pores generated by source rock (including organic matter) degradation and expulsion, the dissolution pores generated by organic acid dissolution of carbonate, and abnormal pressure fractures generated by oil degradation and expulsion form effective spaces for hydrocarbon accumulation and migration, accounting for the reservoir property of calcilutite. As interbedded within calcilutite, rudstone is undercompacted and thus has lager reservoir space than calcilutite, mainly including intergranular pores, intragranular dissolved pores, intergranular fractures, and tectonic fractures. Thus, calcilutite forms self-generating and self-preserving continuous tight reservoirs, whereas rudstone interbedded within marlstone forms tight lithological reservoirs with coexisting source and reservoir. Both types of reservoirs feature particularly low porosity and permeability, strong heterogeneity, high pressure coefficient, and rapid production declines. Additionally, genetic method (chloroform bitumen A method) is used to explore the total amount of hydrocarbon resources in Shulu sag and assess the allocation of total oil production by source rocks. Shulu sag has enormous amount of hydrocarbon resources and great exploitation potential. Advices are finally given for exploration of calcilutite-rudstone reservoirs in Shulu sag.

Key words: Bohai Bay Basin, Shulu sag, calcilutite-rudstone, accumulation mechanism, self-generating reservoir characteristics, exploration potential, the lower third sub-member of Shahejie Formation (Es₃^x)

中图分类号:

TE112.322

赵贤正, 朱洁琼, 张锐锋, 鱼占文, 王吉茂, 郭永军. 冀中坳陷束鹿凹陷泥灰岩-砾岩致密油气成藏特征与勘探潜力[J]. 石油学报, 2014, 35(4): 613-622.

Zhao Xianzheng, Zhu Jieqiong, Zhang Ruifeng, Yu Zhanwen, Wang Jimao, Guo Yongjun. Characteristics and exploration potential of tight calcilutite-rudstone reservoirs in Shulu sag, Jizhong depression, North China[J]. ACTA PETROLEI SINICA, 2014, 35(4): 613-622.

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冀中坳陷束鹿凹陷泥灰岩-砾岩致密油气成藏特征与勘探潜力

Characteristics and exploration potential of tight calcilutite-rudstone reservoirs in Shulu sag, Jizhong depression, North China

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