| 致密砾岩储层微观裂缝特征及对储层的贡献 |
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| 引用本文： | 巩磊,曾联波,陈树民,高帅,张本健,祖克威,苗凤彬.致密砾岩储层微观裂缝特征及对储层的贡献[J].大地构造与成矿学,2016(1):38-46. |
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| 作者姓名： | 巩磊 曾联波 陈树民 高帅 张本健 祖克威 苗凤彬 |
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| 作者单位： | 1. 东北石油大学 黑龙江省普通高校科技创新团队断裂变形、封闭性及流体运移，黑龙江 大庆 163318; 大庆石油管理局博士后科研工作站，黑龙江 大庆 163453;2. 中国石油大学 北京 油气资源与探测国家重点实验室,北京,102249;3. 大庆石油管理局博士后科研工作站,黑龙江 大庆,163453;4. 东北石油大学 黑龙江省普通高校科技创新团队断裂变形、封闭性及流体运移,黑龙江 大庆,163318;5. 中国石油 西南油气田分公司 川西北气矿,四川 江油,621709 |
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| 基金项目： | 国家自然科学青年基金(41502124)，中国博士后科学基金(2015M581424)，国家科技重大专项(2011ZX05003-002)联合资助。 |
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| 摘 要： | 根据微观薄片分析,结合岩芯资料、地表露头以及实验分析,对川西前陆盆地北部九龙山地区致密砾岩储层微观裂缝的成因类型与特征、形成序列、有效裂缝的控制因素以及微观裂缝对储层的贡献进行了探讨。研究结果表明,珍珠冲组致密砾岩储层微观裂缝可以分为穿砾缝、砾缘缝和砾内缝3种类型。微观裂缝以构造成因为主,还有成岩成因微裂缝和原生微裂缝。微观裂缝的充填程度较弱,绝大多数微观裂缝都属于有效裂缝。微观裂缝的有效性主要受裂缝的形成时间、后期溶蚀作用以及异常高压流体等因素的影响。微观裂缝的平均开度为11.0μm,平均面密度为0.85 cm/cm2,反映研究区微观裂缝十分发育。微观裂缝的平均孔隙度为0.78%,占储层总孔隙度的22.9%,平均渗透率为3.18 m D,说明微观裂缝是该区致密砾岩储层重要的储集空间。
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| 关 键 词： | 微观裂缝 成因类型 有效性 致密砾岩储层 |
Characteristics of Micro-fractures and Contribution to the Compact Conglomerate Reservoirs |
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| Abstract: | Based on microscopic thin section analysis and in combination with filed observation, core logging, and experimental results, we investigated the genetic types and validity of micro-fractures in the compact conglomerate of the Zhenzhuchong Formation in the Jiulongshan structure in the north of western Sichuan foreland basin, and discussed their contribution to reservoirs. Three types of micro-fractures, i.e. intragranular, gravel edge, and transgranular fractures, are developed in the compact conglomerate reservoirs of the Zhenzhuchong Formation, and their genetic types are dominated by structural micro-fractures, followed by diagenetic micro-factures and pre-existing micro-fractures. Few of these micro-fractures are filled with minerals, so most of the micro-fractures are effective. The validity of micro-fractures is affected by the age of fractures, dissolution and abnormal pressure. The average aperture of micro-fractures is 11.0 μm and the mean areal density is 0.85 cm/cm2, which illustrate that micro-fractures are well developed in the study area. The average porosity of micro-fractures is 0.78%, which accounts for 22.9% of the reservoir total porosity; and the average permeability is 3.18 mD, which reflects that the micro-fractures are the major storage space in the study area. |
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| Keywords: | micro-fractures original types validity tight conglomerate reservoirs |
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