Quantitative identification of diagenetic facies and controls on reservoir quality for tight sandstones: A case study of the Triassic Chang 9 oil layer, Zhenjing area, Ordos Basin
Quantitative identification of diagenetic facies and controls on reservoir quality for tight sandstones: A case study of the Triassic Chang 9 oil layer, Zhenjing area, Ordos Basin
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致密砂岩成岩相定量识别及储层质量控制——以鄂尔多斯盆地镇泾地区三叠系长9油层为例
DOI：
10.1016/j.marpetgeo.2019.01.025
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发表时间：
2019-04
影响因子：
4.2
通讯作者：
Mao Lixin
中科院分区：
文献类型：
--
作者：
Li Yang;Chang Xiangchun;Yin Wei;Wang Guangwei;Zhang Jinliang;Shi Bingbing;Zhang Jianhua;Mao Lixin
成岩相识别是勘探油气储量和致密油气藏勘探的基础。提出了一种综合利用岩心分析、系统聚类分析和灰色关联分析确定储层成岩相定量指标的方法。通过薄片分析、X射线衍射（XRD）、扫描电镜（SEM）、阴极发光（CL）和压汞毛细管压力（MICP）测试，对长9致密砂岩的岩石学特征、物性和孔隙结构进行了分析。长9砂岩的性质受不同形式的成岩作用的控制：压实作用和方解石的胶结作用减少或堵塞了砂岩中的孔隙体积，但并非所有的胶结作用都对储层质量有害。绿泥石胶结作用有助于保存残余原生孔隙，而长石和不稳定岩屑的直接溶解作用则增强了孔隙连通性。通过岩相学观察和定量分析，将砂岩划分为4种成岩相：方解石胶结相、强烈压实相、颗粒包裹绿泥石孔隙相和溶解相。强烈压实相和方解石胶结相是低质量储层的主要发育相，而颗粒包裹绿泥石相和溶解相所保存的孔隙性储层则具有较好的孔渗性。裂缝的分布通过促进不稳定颗粒的溶解，为油气运移提供了便利的通道和储集空间，从而改善了储层的质量。
The identification of diagenetic facies is essential for prospecting hydrocarbon reserves and for hydrocarbon exploration in tight oil reservoirs. A comprehensive method for determining quantitative index of reservoir diagenetic facies (RDI) using core analysis techniques, hierarchical cluster analyses (HCA), and grey correlation analyses (GCA) was proposed. The petrological characteristics, physical properties, and pore structures of the Chang 9 tight oil sandstones are analysed based on thin-section analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), cathode luminescence (CL) and mercury injection capillary pressure (MICP) tests. The properties of the Chang 9 sandstones were controlled by different forms of diagenesis: Compaction and cementation of calcite have reduced or occluded the pore volume in the sandstones, but not all cementation is deleterious to reservoir quality. Chlorite cementation helped preserve relict primary porosity and the direct dissolution of feldspars and unstable lithic fragments has resulted in enhanced pore connectivity. Following petrographic observations and quantitative analysis, the sandstones were divided into four diagenetic facies: calcite cementation facies, intense compaction facies, porosity preserved by grain-coating chlorites facies, and dissolution facies. The intense compaction facies and calcite cementation facies are responsible for the evolution of low-quality reservoirs, while the reservoirs with porosity preserved by grain-coating chlorites facies and dissolution facies are of better porosity and permeability. The distribution of fractures improves reservoir quality by enhancing the dissolution of unstable grains and providing convenient channels and storage spaces for oil and gas migration.
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