| 鄂尔多斯盆地中西部长9储层差异化成岩与烃类充注过程研究 |
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| 引用本文： | 胡才志,罗晓容,张立宽,邱桂强,雷裕红,程明.鄂尔多斯盆地中西部长9储层差异化成岩与烃类充注过程研究[J].地质学报,2017,91(5):1141-1157. |
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| 作者姓名： | 胡才志 罗晓容 张立宽 邱桂强 雷裕红 程明 |
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| 作者单位： | 中国石油化工股份有限公司石油勘探开发研究院,中国科学院地质与地球物理研究所,中国科学院地质与地球物理研究所,中国石油化工股份有限公司石油勘探开发研究院,中国科学院地质与地球物理研究所,中国科学院地质与地球物理研究所 |
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| 基金项目： | 国家科技重大专项（2011ZX08005-004，2016ZX05002-006），国家自然科学基金（41372151） |
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| 摘 要： | 储层非均质性极大地影响储层内流体的流动和分布,在油气运移成藏和提高采收率研究中广受关注。储层内发生的差异化成岩作用是层内非均质性的重要成因,与烃类充注事件的相互关系也是致密砂岩油气成藏机理研究的核心内容。本文以鄂尔多斯盆地中西部上三叠统延长组长9储层为例,研究储层内砂岩所表现出的差异化成岩作用及其影响下的流体活动过程。系统的显微观察发现,长9储层主要由机械压实致密型砂岩、钙质胶结致密型砂岩、含水砂岩和含油砂岩等四类岩石组成。利用显微岩相学、紫外荧光光谱、包裹体均一温度测试、盆地模拟等技术综合分析表明,机械压实致密型砂岩在早成岩期即在压实作用影响下强烈塑性变形致密化;钙质胶结致密型砂岩在早成岩期就发生强烈的碳酸盐胶结作用而致密化。这两类砂岩在成岩中后期基本不能为流体活动提供孔隙空间。含水砂岩和含油砂岩均经历了复杂的差异化成岩过程,含油砂岩内可以辨识出至少三期沥青,含水砂岩则未见沥青残留。以含油砂岩中沥青质所对应的烃类充注为标志,重建了长9储层的成岩序列,划分出三期流体流动过程,烃类充注与成岩作用交替进行。含水砂岩大致可划分出相似的成岩过程,但未发生烃类充注。
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| 关 键 词： | 差异化成岩作用，烃类充注，致密砂岩，长9油层组，鄂尔多斯盆地 |
| 收稿时间： | 2016/3/13 0:00:00 |
| 修稿时间： | 2017/2/26 0:00:00 |
Differential Diagenesis and Hydrocarbon Charge Process of the 9th Member of Yanchang Formation in the Central and Western Ordos Basin |
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| HU Caizhi,LUO Xiaorong,ZHANG Likuan,QIU Guiqiang,LEI Yuhong and CHENG Ming.Differential Diagenesis and Hydrocarbon Charge Process of the 9th Member of Yanchang Formation in the Central and Western Ordos Basin[J].Acta Geologica Sinica,2017,91(5):1141-1157. |
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| Authors: | HU Caizhi LUO Xiaorong ZHANG Likuan QIU Guiqiang LEI Yuhong and CHENG Ming |
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| Institution: | Petroluem Exploration and Production Research Institute,Sinopec,Institute of Geology and Geophysics, Chinese Academy of Sciences,Institute of Geology and Geophysics, Chinese Academy of Sciences,Exploration DdDd Production Research Institute, SINOPEC,Institute of Geology and Geophysics, Chinese Academy of Sciences,Institute of Geology and Geophysics, Chinese Academy of Sciences |
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| Abstract: | Reservoir heterogeneity affects subsurface fluid flow and distribution and has been paid close attention in the study on hydrocarbon migration and enhanced oil recovery. The differential diagenesis in clastic rock reservoir, as one important factor of inner-reservoir heterogeneity, and its interaction with hydrocarbon charge are the core of the hydrocarbon accumulation mechanism of tight sand reservoirs . The authors focused on the 9th member of Yanchang formation, the upper Triassic in the central and west of Ordos Basin, for the destination of characterizing the differential diagenesis of sandstone reservoirs and reconstructing the process of subsurface fluid and rock interaction. A systematic micro observation illustrates that the 9th member of Yanchang formation reservoir is constituted of four types sands, namely ductile-debris-rich tight sand, calcite-cement tight sand, water bearing sand and oil bearing sand. Based on Integrated utilizing multi-techniques, microphysical, ultra-violate fluorescence spectrum, saline water bearing fluid inclusion homogeneous temperature, basin modeling, and so on, the authors discovered that the ductile-debris-rich tight sand and the calcite-cement tight sand had been experienced strongly deforming and cementing and respectively, during the early diagenesis process. The water bearing sand and oil bearing sand had experienced differential and multi-phase diagenesis. Less than three types bitumen are identified in oil bearing sand while there are none of bitumen in water bearing sand. According to the contact relationship between bitumen and cements and dissolution pores, the related diagenesis sequence of the 9th member of Yanchang formation has been reconstructed. Three phase fluid flow occurred in turn with hydrocarbon charging in the process, while there is no hydrocarbon charging occurred in the water bearing sand. |
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| Keywords: | differential diagenesis hydrocarbon charge tight sand reservoir the 9th member of Yanchang formation Ordos Basin |
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