岩相构型对致密砂岩优质储层的控制作用——以川西坳陷须二段为例

发布时间：2018-07-06 08:26

本文选题：岩相构型 + 须家河组　；参考：《天然气地球科学》2016年07期

【摘要】：针对致密砂岩优质储层的沉积成因机制及其分布模式不完善的情况,拟探讨不同岩相构型叠置样式对致密砂岩优质储层的控制作用。利用野外露头、地震资料、样品分析化验资料、测井资料及生产测试资料,结合砂体结构分析法、沉积岩相分析法及岩相组合成因分析法等开展岩相构型控制下致密砂岩优质储层的分布模式研究。研究表明:1不同岩相构型揭示了不同的沉积环境。须家河组二段典型的岩相构型样式有5种,其与沉积亚相具有较好的对应关系。2岩相构型对储层质量具有重要的控制作用。取样分析揭示了块状层理细—粉砂岩孔隙度均值小于交错层理粉砂岩孔隙度均值,其中块状层理细—粉砂岩储层(河道主体)顶部孔隙度比底部及侧翼要高,交错层理粉砂岩储层(废弃河道)则表现为中心及底部孔隙度值高,其侧翼及其顶部孔隙度低。3岩相构型对含气性的控制作用明显。分层系数越高,含气性高产的可能性就越大,分层系数越低,水层的可能性越大。相变带及裂缝发育带是控制含气性的2个关键因素,相变带和裂缝发育带的耦合则是形成高产井气藏的必要条件。
[Abstract]:In view of the imperfection of sedimentary genetic mechanism and distribution pattern of compact sandstone high quality reservoir, the control effect of different lithofacies superposition patterns on compact sandstone high quality reservoir is discussed. Using field outcrop, seismic data, sample analysis and test data, well logging data and production test data, combined with sand body structure analysis, Sedimentary lithofacies analysis and lithofacies assemblage genetic analysis are used to study the distribution pattern of high quality tight sandstone reservoirs controlled by lithofacies configuration. The results show that different lithofacies configurations reveal different sedimentary environments. There are five typical lithofacies structures in the second member of Xujiahe formation, which has a good correspondence with sedimentary subfacies .2 lithofacies configuration plays an important role in controlling reservoir quality. The sample analysis shows that the mean porosity of block bedding fine siltstone is smaller than that of staggered siltstone, in which the top porosity of block bedding fine siltstone reservoir is higher than that of bottom and flank. The staggered bedding siltstone reservoir (abandoned channel) is characterized by high porosity at the center and bottom, and its flank and its top porosity are low. 3 lithofacies configuration has obvious effect on controlling the gas bearing property. The higher the stratification coefficient, the greater the probability of gas-bearing high yield, the lower the stratification coefficient, the greater the possibility of water layer. The phase change zone and fracture development zone are two key factors to control the gas-bearing property, and the coupling of the phase change zone and the fracture development zone is the necessary condition for the formation of high production well gas reservoir.
【作者单位】：长江大学录井技术与工程研究院;中国石化西南油气分公司勘探开发研究院;长江大学地球科学学院;
【基金】：国家自然科学基金项目(编号:41502126) 长江大学青年基金项目(编号:2015cqn55) 中国石油大学(北京)油气资源与探测国家重点实验室开放基金项目(编号:PRP/open-1510)联合资助
【分类号】：P618.13

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