Origin of the reservoir quality difference between Chang 8 and Chang 9 Member sandstones in the Honghe Oil Field of the Southern Ordos Basin, China
Origin of the reservoir quality difference between Chang 8 and Chang 9 Member sandstones in the Honghe Oil Field of the Southern Ordos Basin, China
复制标题
鄂尔多斯盆地南部红河油田长8、长9段砂岩储层质量差异成因
DOI：
10.1016/j.petrol.2019.106668
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发表时间：
2020-02
影响因子：
--
通讯作者：
Shao Longkan
中科院分区：
文献类型：
--
作者：
Liu Hongping;Zhao Yanchao;Luo Yang;Xiao Gaojian;Meng Yujing;Zhou Sibin;Shao Longkan
了解致密油砂岩油藏的储集层性质和非均质性，对其勘探开发具有重要意义。为了解鄂尔多斯盆地红河油田延长组长8、长9砂岩储集层物性差异，综合分析了岩性、成岩作用和油气侵位因素，利用岩心、测井、铸件薄片、扫描电子显微镜、阴极发光成像和X射线衍射仪等资料，研究了鄂尔多斯盆地红河油田延长组长8、长9砂岩储集层物性差异。结果表明，长8、长9砂岩主要为细粒-中粒长石岩屑砂岩和岩屑长石砂岩，分选中等-良好，发育辫状三角洲前缘水下分流河道相。长8和长9砂岩的平均孔隙度和渗透率分别为8.52%、0.27mD和12.96%、2.86mD。成岩作用类型主要有机械压实作用、自生绿泥石作用、方解石胶结作用和溶蚀作用。长8、长9砂岩储层质量差异主要是油气充注和成岩环境变化的结果。靠近烃源岩的长8砂岩具有较高的长石含量和酸性流体注入引起的岩屑溶蚀和颗粒坍塌，大大降低了孔渗性。而远离NW-SE向断裂的长9砂岩充油和注入酸性流体较少，导致绿泥石含量高，使喉道变窄，渗透率降低，但孔隙度略有降低。长9段只有长8段底部或NW-SE向断裂附近的砂岩具有少量的酸性溶蚀作用，绿泥石含量中等，孔渗性较高。方解石胶结物含量高，主要分布在砂体顶部或底部，并不是导致长8、长9砂岩储集层质量差异的主要因素。
Understanding the reservoir quality and heterogeneity of tight oil sandstone reservoirs is essential for their exploration and production. An integration of lithological, diagenetic and hydrocarbon emplacement factors was analyzed to understand the reservoir quality difference in Chang 8 and Chang 9 sandstones of Yanchang Formation, Honghe Oil Field, Ordos Basin, using core, well logs, casting thin sections, SEM, cathode luminescence images and x-ray diffraction data. The results show that Chang 8 and Chang 9 sandstones are mainly fine to medium-grained feldspathic litharenites and lithic arkose with moderately well to well sorting, from braided-delta front subaqueous distributary channel facies. The average porosity and permeability of Chang 8 and Chang 9 sandstones are 8.52%, 0.27mD and 12.96%, 2.86mD, respectively. The main diagenesis types are mechanical compaction, authigenic chlorite, calcite cement, and dissolution. The Chang 8 and Chang 9 sandstone reservoir quality difference is mainly a result of the oil charging and diagenetic environment change. The Chang 8 sandstones that close to the source rock have a high content of feldspar and lithic dissolution and grain collapse from the acidic fluids injection, which dramatically decrease porosity and permeability. Whereas, the Chang 9 sandstones far from the NW-SE direction faults have a small amount of oil charging and acidic fluid injection, which result in high content of chlorite that narrow the throats and reduce permeability, but slightly reduce porosity. Only the sandstones at the bottom of Chang 8 or close to the NW-SE direction faults in Chang 9 Member have a small amount of acidic dissolution, medium content of chlorite, which lead to the relatively high porosity and permeability. High calcite cement contents are mainly observed at the top or bottom of the sandbody, which is not the main factor that leads to the Chang 8 and Chang 9 sandstone reservoir quality difference.
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