| 黄河口凹陷H-1构造沙河街组混积岩储层控制因素 |
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| 引用本文： | 霍沈君,杨香华,王清斌,周心怀,朱红涛,王维.黄河口凹陷H-1构造沙河街组混积岩储层控制因素[J].现代地质,2015,29(6):1348-1359. |
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| 作者姓名： | 霍沈君 杨香华 王清斌 周心怀 朱红涛 王维 |
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| 作者单位： | (1. 中国地质大学(武汉)构造与油气资源教育部重点实验室，湖北 武汉 430074；2. 中国地质大学(武汉)资源学院，湖北 武汉 430074；3. 中海石油(中国)有限公司天津分公司，天津 300452) |
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| 基金项目： | 国家科技重大专项“近海富烃凹陷资源潜力再评价和新区、新领域勘探方向”子课题“富烃凹陷特征及类比研究”(2008ZX05023-001-01)。 |
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| 摘 要： | 黄河口凹陷H-1构造位于渤南低凸起南侧，其主力储层为一套典型的混积岩。通过对H-1构造混积岩储层特征及白云岩成因的分析，认为H-1构造沙河街组混积 岩储层储集空间受控于沉积时期的古地理背景、古水质条件与后期的白云岩化程度。古地理背景与古水质条件是混积岩发育的基础，研究区位于扇三角洲前缘侧翼，受到陆源淡水供给与半封闭的微咸水 -半咸水湖水的双重影响，发育了由陆源碎屑与生物碎屑滩构成的混积岩。后期白云岩化作用是改善储层的关键因素，等摩尔交代对渗透率的提高以及白云岩化作用引发的选择性溶蚀，对储层物性的改 善有很大的影响。混积岩储集性能差异较大，当物源供给的淡水影响较大时，混积岩中碳酸盐以方解石为主，储层较致密；当咸化湖水影响较大时，混积岩中碳酸盐主要为白云石，储层的溶蚀孔隙较发 育。化石碎片的背散射图片清晰地证实了混积岩中的白云石是由方解石转化而成。通过对古生物、粘土矿物、古地理背景等资料的分析，认为在伊蒙混层向伊利石的转化过程中产生的Mg离子是研究区沙 河街组白云岩化作用所需离子的来源之一，亚热带气候条件下半封闭的微咸水-半咸水环境有利于钙质的沉积和Mg离子的富集，可为混积岩的白云岩化提供物质基础。研究黄河口凹陷古近系混积岩储层控 制因素及优质储层发育规律，对该区中深层油气勘探具有积极意义和参考价值。
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| 关 键 词： | H-1构造 混积岩 储层控制因素 白云岩化 沙河街组 |
Controlling Factors on Diamictite Reservoir in Shahejie Formation,H-1 Structure,Huanghekou Depression |
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| Institution: | (1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, China; 2. Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China; 3. CNOOC Ltd., Tianjin Branch, Tianjin 300452, China) |
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| Abstract: | H-1 sturcture of Huanghekou Depression,is on the south of Bonan Lower Uplift, in which the main reservoir is diamictite. By analysing the characteristics of diamictite and the origin of dolostones, we believe that the reservoir space of diamictite in Shahejie Formation is controlled by the paleogeographic background of sediment, the paleohydrogeologic conditions and the degree of dolomitization later. Paleogeographic background and paleohydrogeologic conditions are the basis for controlling the formation of diamictite. The research area is located in the fan delta front wing which is affected by both terrigenous fresh water and semi-closed brackish water. Such an environment is beneficial to the growth of diamictite which is made up of terrigenous clastic and bioclastic beach. Dolomitization is the key factor to reform reservoir quality, for the mole-to-mole replacement of Ca2+ by Mg2+ and the selective dissolution after partly dolomitization both enlarge the porosity or permeability. However, there is a great difference among the diamictite reservoirs. When the fresh water has a greater influence on the sediment, the carbonate in diamictite is mainly composed of calcite and the diamictite under such circumstances has poor reservoir capacity. On the contrary, when diamictite are greatly influenced by brackish water, dolomite occupies the most of carbonate and the diamictite has better reservoir capacity. Fossil fragments of back scattering images clearly confirmed the metasomatic origin of dolomite. Based on analysis on paleontology, clay mineral and paleogeographic background data, we found that the Mg2+ which dolomitization needs is partly from the transformation of illite-montmorillonite mixed-layer to illite. The water environment of sediment for subtropical climate is semi-closed brackish water and such environment is benefit to the deposition of calcium and enrichment of Mg2+. Meanwhile, the rich Mg2+ can provide material for dolomitization. The research of controlling factors and development law on diamictite reservoir have positive significance on the exploration of deep reservoirs. |
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| Keywords: | H-1 structure diamitictite controlling factors on reservoir dolomitization Shahejie Formation |
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