环县—正宁地区延长组长9致密油富集规律研究

发布时间：2018-03-26 02:56

本文选题：环县-正宁地区　切入点：沉积相　出处：《西安石油大学》2017年硕士论文

【摘要】：本文以环县-正宁地区三叠系延长组长9为研究对象,运用扫描电镜、阴极发光、铸体薄片等测试技术,以野外露头数据、岩心数据、测井资料、测试分析资料为基础,进行沉积相特征、储层特征以及成藏主控因素研究。取得的认识主要有:研究区长9沉积相类型为辫状河三角洲相,研究区内以辫状河三角洲前缘亚相为主。研究区岩性主要为岩屑长石砂岩;长9储层类型既包括低渗储层,也包括致密储层。孔隙度分布区间为0.32%~20.8%,平均值为10.47%,。渗透率分布区间为0.001×10-3μm2~261.71×10-3μm2,平均值为3.2×10-3μm2。储层孔隙类型主要为粒间孔、长石溶孔。研究区主要成岩作用为:压实作用、胶结作用、交代作用和溶蚀作用。本文对环县-正宁地区长9油藏富集主控因素进行研究。其中,局部构造对油水分布的控制作用较弱;油源特征控制油气分布,其一,研究区长9油藏充注度存在不高、油源不足;其二,研究区长7烃源岩生烃强度主要分布在(100~500)×104t/km2,主力烃源岩位于长7段,长9储层位于其下伏,长7段烃源岩生成石油向下运移穿过长8进入长9才聚集成藏,长7烃源岩对长9油藏形成与分布的控制作用尤为明显;其三,储盖组合及砂体特征控制油气分布,具体为长8薄砂泥岩岩性组合以及长8砂地比控制油气下移与分布。
[Abstract]:Based on field outcrop data, core data, well logging data and test and analysis data, this paper takes Yanchang 9 of Triassic system in Huanxian-Zhengning area as research object, using scanning electron microscope, catholuminescence, casting thin slice and other testing techniques. The characteristics of sedimentary facies, reservoir characteristics and the main controlling factors of reservoir formation are studied. The main results are as follows: Chang9 sedimentary facies in the study area are braided river delta facies, The study area is mainly composed of braided river delta front subfacies, lithology is mainly lithic feldspathic sandstone, Chang9 reservoir type includes low permeability reservoir, The porosity distribution interval is 0.32 ~ 20.8 with an average value of 10.470.The permeability distribution interval is 0.001 脳 10 ~ (-3) 渭 m ~ (-2), 261.71 脳 10 ~ (-3) 渭 m ~ (-2) and the average is 3.2 脳 10 ~ (-3) 渭 m ~ (2). The pore types of reservoir are mainly intergranular pores and feldspar dissolved pores. The main diagenesis of the study area is compaction, cementation, cementation, etc. Metasomatism and dissolution. In this paper, the main enrichment control factors of Chang9 reservoir in Huanxian-Zhengning area are studied. Among them, the control of local structures on the distribution of oil and water is weak, and the oil source characteristics control the distribution of oil and gas. Second, the hydrocarbon generation intensity of Chang7 source rock is mainly distributed in Yum100 ~ (500) 脳 10 ~ 4 t / km ~ (2), the main source rock is located in Chang 7 formation, and Chang 9 reservoir is located below it. The source rocks of Chang 7 are transported downward through Chang 8 to Chang 9 to form reservoirs, and the source rocks of Chang 7 control the formation and distribution of Chang 9 reservoir, and the reservoir cap assemblage and sand body characteristics control the distribution of oil and gas, and the formation and distribution of Chang 9 reservoir are controlled by reservoir cap assemblage and sand body characteristics. It is the lithologic assemblage of Chang 8 thin sand and mudstone and the oil and gas migration and distribution controlled by the ratio of Chang 8 sand to ground.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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