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The sandstone reservoir characteristics and controlling factors of Shanxi Formation and Lower Shihezi Formation in Southeastern Ordos Basin
Geological Journal ( IF 1.4 ) Pub Date : 2020-10-18 , DOI: 10.1002/gj.4019 Wenguo Xu 1 , Hongwen Deng 1 , Yating Wang 2
Geological Journal ( IF 1.4 ) Pub Date : 2020-10-18 , DOI: 10.1002/gj.4019 Wenguo Xu 1 , Hongwen Deng 1 , Yating Wang 2
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The southeastern Ordos Basin hosts considerable resource potentials and contains significant hydrocarbon discoveries in the Shanxi Formation and Lower Shihezi Formation, making it a significant petroliferous exploration area. In this study, wireline logs, mud logs, cores, thin sections, scanning electron microscope, heavy minerals, porosity and permeability data, and grain size are employed to carry out research on reservoir differentiation characteristics and associated controlling factors in the Shanxi Formation and Lower Shihezi Formation. The results indicate that reservoir sandstone mainly includes lithic sandstone, quartz sandstone, and lithic quartz sandstone. The pore types are dominated by secondary intergranular pore, intragranular dissolution pore, followed by intercrystal pore and microcracks. The porosity and permeability attain 7.9% and 0.59 10−3 μm2 respectively which shows low porosity and low permeability. The differences of sandstone reservoirs in the Lower Shihezi Formation and Shanxi Formation are controlled by tectonic movements, sedimentary environments, and diagenesis. Tectonic movements not only provide potential provenance but also reconstruct physical property. Sedimentary environments determine sandstone composition and texture and controls reservoir heterogeneity. The diagenesis affects the preservation, evolution, and development of reservoirs and determines the quality of physical property.
中文翻译：
鄂尔多斯盆地东南部山西组和下石子子组砂岩储层特征及控制因素
鄂尔多斯盆地东南部蕴藏着巨大的资源潜力，并且在山西组和下石子子组中蕴藏着重要的油气发现，使其成为重要的石油勘探区。本研究利用电缆测井曲线，泥浆测井曲线，岩心，薄片，扫描电镜，重矿物，孔隙度和渗透率数据以及粒度对山西组及下组储层的分异特征及相关控制因素进行了研究。石河子组。结果表明，储集层砂岩主要包括岩性砂岩，石英砂岩和岩性石英砂岩。孔类型主要是次生的粒间孔，粒内溶解孔，然后是晶间孔和微裂纹。孔隙率和渗透率达到7。-3微米2分别示出了低的孔隙率和低透气性。下石河子组和山西组砂岩储层的差异受构造运动，沉积环境和成岩作用的控制。构造运动不仅提供了潜在的物源，而且还重建了物理性质。沉积环境决定了砂岩的成分和质地，并控制了储层的非均质性。成岩作用影响储层的保存，演化和发育，并决定物性的质量。
更新日期：2020-10-18
中文翻译：
鄂尔多斯盆地东南部山西组和下石子子组砂岩储层特征及控制因素
鄂尔多斯盆地东南部蕴藏着巨大的资源潜力，并且在山西组和下石子子组中蕴藏着重要的油气发现，使其成为重要的石油勘探区。本研究利用电缆测井曲线，泥浆测井曲线，岩心，薄片，扫描电镜，重矿物，孔隙度和渗透率数据以及粒度对山西组及下组储层的分异特征及相关控制因素进行了研究。石河子组。结果表明，储集层砂岩主要包括岩性砂岩，石英砂岩和岩性石英砂岩。孔类型主要是次生的粒间孔，粒内溶解孔，然后是晶间孔和微裂纹。孔隙率和渗透率达到7。-3微米2分别示出了低的孔隙率和低透气性。下石河子组和山西组砂岩储层的差异受构造运动，沉积环境和成岩作用的控制。构造运动不仅提供了潜在的物源，而且还重建了物理性质。沉积环境决定了砂岩的成分和质地，并控制了储层的非均质性。成岩作用影响储层的保存，演化和发育，并决定物性的质量。
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