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| 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 |
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张少敏1,2,操应长1,2,王艳忠1,2,杨田1,2,王尉1,王思佳1,2
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(1.中国石油大学地球科学与技术学院,山东青岛 266580;2.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,山东青岛 266071)
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| 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。 |
| 关键词: 成岩作用 成岩演化 物性演化 浊积岩 牛庄洼陷 |
| DOI：10.3969/j.issn.1673-5005.2017.02.001 |
| 分类号::TE 122.2 |
| 文献标识码:A |
| 基金项目: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) |
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| Diagenesis and physical properties evolution of turbidite reservoirs in Es3z of Niuzhuang sag, Dongying Depression |
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ZHANG Shaomin1,2, CAO Yingchang1,2, WANG Yanzhong1,2, YANG Tian1,2, WANG Wei1, WANG Sijia1,2
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China)
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| Abstract: |
| A comprehensive analysis was conducted to evaluate the diagenesis and property evolution of Es3z in Niuzhuang sag, by combining core observation, thin section identification, image analysis, fluid inclusion analysis, carbon and oxygen isotope analysis and physical property test. The burial, thermal and hydrocarbon charging history of the reservoirs were also taken into consideration. The results show that the turbidite reservoirs of Es3z are characterized with low porosity and permeability, and may have experienced diagenetic environment changes through the sequence of weak alkaline, acidic, alkaline, and weak acidic conditions. With various diagenesis, the main dissolving-cementation sequence was:early siderite and calcite cementation; feldspar dissolution/quartz overgrowth/authigenic kaolinite precipitation; first hydrocarbon charging; ferrocalcite/ankerite cementation/quartz dissolution; second hydrocarbon charging; a small amount of feldspar dissolution/quartz overgrowth/pyrite cementation, and finally compaction existing throughout the whole burial history. According to the matching relation of reservoir physical properties and hydrocarbon accumulation, both conventional reservoirs and tight reservoirs coexisted in the turbidites, and the tight reservoirs could be further divided into two types, one became tight reservoirs during hydrocarbon accumulation and the other became tight before hydrocarbon accumulation. It is concluded that the best exploration targets are the conventional reservoirs followed by reservoirs becoming tight during hydrocarbon accumulation, and then the reservoirs becoming tight before hydrocarbon accumulation. |
| Key words: diagenesis diagenetic evolution physical properties evolution turbidite Niuzhuang sag |
