| 致密砂岩酸性和碱性成岩环境特征及对储层物性的控制:以鄂尔多斯盆地临兴和神府地区为例 |
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| 引用本文： | 尹相东,蒋恕,吴鹏,高伟.致密砂岩酸性和碱性成岩环境特征及对储层物性的控制:以鄂尔多斯盆地临兴和神府地区为例[J].地质科技通报,2021,40(1):142-151. |
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| 作者姓名： | 尹相东 蒋恕 吴鹏 高伟 |
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| 作者单位： | 西南石油大学地球科学与技术学院;中国地质大学（武汉）资源学院;中国地质大学（武汉）构造与油气资源教育部重点实验室;中海石油（中国）有限公司非常规油气分公司;中国石油长庆油田分公司油气工艺研究院 |
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| 基金项目： | 国家自然科学基金项目42002176国家自然科学基金项目41872165中国石油-西南石油大学创新联合体科技合作项目2020CX030000中国石油-西南石油大学创新联合体科技合作项目2020CX050020中海油重大专项CNOOC-KJ135ZDXMLTD14构造与油气资源教育部重点实验室开放课题TPR-2019-13 |
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| 摘 要： | 成岩流体酸碱性对砂岩次生孔隙的形成具有重要影响。从酸性和碱性成岩流体演化角度分析鄂尔多斯盆地上古生界致密砂岩成岩流体酸碱性对物性的控制作用。依据大量铸体薄片观察、扫描电镜、X衍射分析、常规物性测试和高压压汞,详细研究了鄂尔多斯盆地东缘临兴和神府地区上古生界致密砂岩的岩石矿物学特征、物性特征、成岩作用、孔隙成因类型和孔喉结构特征,探讨了致密砂岩储层酸性和碱性成岩流体环境的识别、分带、分布和发育的各类伴生孔隙,并分析了成岩流体环境的演化过程及物性响应特征。在埋藏过程中,工区上组合层系经历了碱性-酸性-碱性的成岩流体演变模式,下组合含煤层系经历了酸性-碱性的成岩流体演变模式。酸性成岩环境以长石溶蚀、石英加大和自生高岭石沉淀为主要特征,发育长石溶蚀孔、黏土矿物晶间孔等孔隙类型,孔喉半径较大,储层质量相对较好;碱性成岩环境以石英溶蚀、自生绿泥石沉淀为主要特征,以石英溶蚀孔、黏土矿物晶间孔为主要孔隙类型,孔喉半径较小,储层质量相对较差。酸碱过渡带致密砂岩储层介于两者之间。但是每类储层的物性和孔喉结构变化较大。成岩流体环境在纵向上呈现分带特征,自上而下发育碱性带、酸碱过渡带、酸性带、酸碱过渡带和碱性带,不同地区之间分带深度边界有差别;在酸碱过渡带中,局部地区发育酸性带、较弱酸性带和较弱碱性带。
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| 关 键 词： | 致密砂岩 酸性成岩环境 碱性成岩环境 上古生界 鄂尔多斯盆地 |
| 收稿时间： | 2020-01-08 |
Features of the acid and alkaline diagenetic environment of tight sandstones and the control of the reservoir physical properties: A case study of the Linxing and Shenfu district,eastern Ordos Basin |
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| Yin Xiangdong,Jiang Shu,Wu Peng,Gao Wei.Features of the acid and alkaline diagenetic environment of tight sandstones and the control of the reservoir physical properties: A case study of the Linxing and Shenfu district,eastern Ordos Basin[J].Bulletin of Geological Science and Technology,2021,40(1):142-151. |
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| Authors: | Yin Xiangdong Jiang Shu Wu Peng Gao Wei |
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| Institution: | (School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China;Unconventional Oil&Gas Branch,CNOOC Ltd.,Beijing 100011,China;Oil&Gas Technology Research Institute,PetroChina Changqing Oilfield Company,Xi'an 710021,China) |
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| Abstract: | The pH value of plaeofluid exerts great influence on the formation of the secondary pores of sandstones.In the paper, the control of the acid and alkaline diagenetic fluid environment on the reservoir quality was analyzed in the Upper Paleozoic tight sandstones in the Ordos basin.Based on the plenty of survey of casting thin section, scanning electron microscope, X-ray diffraction, routine testing of physical properties, and high pressure mercury injection, the characteristics of petrology and mineralogy, physical properties, diagenesis, genetic types of pores, and pore-throat structure within the Upper Paleozoic tight sandstones were detailedly investigated in the Linxing and Shenfu district, eastern Ordos Basin.The identification, zonage, and distribution of the acid and alkaline diagenetic environment within tight sandstones as well as the evolution of diagenetic fluid environment and its reponse of the physical properties were investigated.Results showed that the upper strata underwent a diagenetic fluid evolution of alkaline-acid-alkaline mode during the burial process, whereas the lower strata experienced a mode of acid-alkaline.Acid diagenetic environment was characterized by feldspar dissolution, quartz overgrowth, and deposition of authigenic kaolinite, in which feldspar dissolution pores, intercrystalline pores of clay minerals developed with relatively large pore radius and better reservoir quality.Alkaline diagenetic environment was featured by quartz dissolution and deposition of authigenic chlorite, in which quartz dissolution pores and intercrystalline pores of clay minerals developed with relatively small pore radius and poor reservoir quality.The case of transitional zone of acid and alkaline zone(TZAA) falls in between acid zone(AZ) and alkaline zone(AlZ).Nevertheless, the physical properties are best in the AZ, followed by TZAA.The distribution of the AZ, AIZ and TAZZ and their responds to the physical properties are significant to the reservoir evaluation. |
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| Keywords: | tight sandstone acid diagenetic environment alkaline diagenetic environment Upper Paleozoic Ordos Basin |
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