| 渤海湾地区Z油田沙一下生物灰岩油藏裂缝特征及其形成机理 |
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| 引用本文： | 严锐涛,曾联波,赵向原,廖宗湖,陈敏政.渤海湾地区Z油田沙一下生物灰岩油藏裂缝特征及其形成机理[J].地质科学,2016,0(2):484-493. |
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| 作者姓名： | 严锐涛 曾联波 赵向原 廖宗湖 陈敏政 |
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| 作者单位： | 1. 中国石油大学(北京)地球科学学院 北京 102249;
2. 中国石化石油勘探开发研究院 北京 100083;
3. 中海油深圳分公司研究院 广州 510240 |
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| 摘 要： | 以渤海湾地区Z油田沙一下生物灰岩油藏为例, 利用岩心、薄片及成像测井等资料, 对天然裂缝特征及控制因素进行研究, 并对裂缝的成因机理进行了分析.研究表明, Z油田沙一下生物灰岩储层主要发育构造裂缝及成岩裂缝两种类型, 其中构造裂缝又分为剪切裂缝及扩张裂缝两类; 大多数构造裂缝为高角度缝, 主要方位为北东-南西向、北西-南东向及近东西向; 裂缝纵向高度一般小于170 cm, 裂缝平面长度主要分布在35 m以内, 裂缝开度主要在100 μm以内; 裂缝的发育受岩性、岩层厚度、断层等地质因素控制.该区构造裂缝主要在始新世-渐新世裂陷中后期北西-南东向引张应力场及东营末期北东东-南西西向反转挤压应力场两期构造应力作用下形成, 其中早期主要形成北东-南西向的正断层型裂缝, 晚期主要形成北东-南西向、北西-南东向的剪切裂缝及近东西向扩张裂缝.
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| 关 键 词： | 天然裂缝 灰岩储层 形成机理 沙河街组 渤海湾盆地 |
| 收稿时间： | 2015-09-15 |
| 修稿时间： | 2015-09-15; |
Fracture development characteristics and its formation mechanism in Lower Member 1 Shahejie biolithite reservoir,Z oilfield,Bohai Bay |
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| Yan Ruitao,Zeng Lianbo,Zhao Xiangyuan,Liao Zonghu,Chen Minzheng.Fracture development characteristics and its formation mechanism in Lower Member 1 Shahejie biolithite reservoir,Z oilfield,Bohai Bay[J].Chinese Journal of Geology,2016,0(2):484-493. |
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| Authors: | Yan Ruitao Zeng Lianbo Zhao Xiangyuan Liao Zonghu Chen Minzheng |
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| Institution: | 1. College of Geoscience, China University of Petroleum, Beijing 102249;
2. Exploration & Production Research Institute, SINOPEC, Beijing 100083;
3. Research Institute of Shenzhen Branch Company, CNOOC, Guangzhou 510240 |
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| Abstract: | Based on cores, thin sections and FMI data, the characteristics and controlling factors of natural fractures in biolimestone reservoir in Lower Member 1 of Shahejie Formation in Bohai Bay area were studied. The formation mechanism was then analyzed. The results showed that fractures were mostly generated by structure movement and diagenesis. The fractures caused by structure movement could be further divided into shear fractures and extension fractures. Most of the structural fractures were high-angle fractures and the strike were mainly NE-SW, NW-SE and near EW. The height of the fractures was always less than 170 cm, the length was less than 35 m and the aperture was less than 100 μm. The distribution of the fractures was controlled by lithology and thickness of the reservoir and faults. The fractures were mainly formed in NW-SE extensional stress field in the mid-late rift period of Eocene-Oligocene and in NEE-SWW compressive stress field of Late Dongying period. The fractures formed in early stage were largely NE-SW normal fault style fractures and the fractures in late stage were mainly NE-SW, NW-SE shear fractures and near EW extensional fractures. |
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| Keywords: | Natural fracture Limestone reservoir Formation mechanism Shahejie Formation Bohai Bay Basin |
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