牛庄洼陷西南部沙三中亚段浊积岩储层成岩作用与物性演化

发布时间：2018-07-13 19:55

【摘要】：通过岩心观察、薄片鉴定、图像分析、包裹体分析、碳氧同位素分析及物性测试等技术方法,结合埋藏史、有机质热演化史和油气成藏史,对东营凹陷牛庄洼陷西南部沙三中亚段浊积岩储层成岩作用与物性演化进行研究。结果表明:沙三中亚段浊积岩储层整体以中低孔—低渗特低渗为特征,经历了弱碱性—酸性—碱性—弱酸性的成岩环境演化过程;成岩作用类型多样,主要胶结溶解作用序列为早期菱铁矿胶结/早期方解石胶结→长石溶蚀/石英加大/自生高岭石沉淀→铁方解石、铁白云石胶结/少量石英溶蚀→少量长石溶蚀/石英加大/黄铁矿胶结,压实作用存在于整个埋藏过程中;物性演化与油气成藏史的匹配关系表明,沙三中亚段浊积岩常规储层与致密储层共存,其中致密储层分为"边致密边成藏型"和"先致密后成藏型"两种类型;常规储层主要位于中厚层砂岩的中部,对勘探最有利,其次为"边致密边成藏型"储层,主要存在于中厚层砂岩的顶部或底部,"先致密后成藏型"储层最不利,多为薄层砂岩。
[Abstract]:By means of core observation, slice identification, image analysis, inclusion analysis, carbon and oxygen isotope analysis and physical property testing, combined with burial history, organic matter thermal evolution history and oil and gas accumulation history, The diagenesis and physical property evolution of turbidite reservoir in the middle part of the third member of Sha 3 in the southwestern Niuzhuang sag of Dongying Sag are studied. The results show that the turbidite reservoir in the middle part of the third member of Sha 3 is characterized by low porosity, low permeability and ultra-low permeability, and has undergone the diagenetic environment evolution process of weak alkalinity, acidity, alkalinity and weak acidity, and the diagenesis types are various. The main sequence of cementation dissolution is early siderite cementation / early calcite cementation feldspar dissolution / quartz enlargement / authigenic kaolinite precipitation calcite. Iron dolomite cementation / a small amount of quartz dissolution / feldspar dissolution / quartz enlargement / pyrite cementation, compaction exists in the whole burial process. The turbidite conventional reservoir and tight reservoir coexist in the middle part of Sha 3, in which the compact reservoir is divided into two types: "edge tight and edge forming" and "first dense and then later formed", and the conventional reservoir is mainly located in the middle of middle thick sandstone, which is the most favorable for exploration. The second is the "edge tight side reservoir" reservoir, which mainly exists at the top or bottom of medium and thick sandstone, and the "first dense and later reservoir forming type" reservoir is the most unfavorable, mostly thin layer sandstone.
【作者单位】：中国石油大学地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家科技重大专项(2011ZX05006-003) 国家自然科学基金石油化工联合基金重点项目(U1262203) 中央高校基本科研业务费专项(15CX06009A)
【分类号】：P618.13

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