| 黄河口凹陷渤中27-A构造沙一二段湖相混积岩储层特征及成因 |
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| 引用本文： | 代黎明,牛成民,庞小军,冯冲,万琳,金小燕.黄河口凹陷渤中27-A构造沙一二段湖相混积岩储层特征及成因[J].地球科学,2020,45(10):3797-3807. |
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| 作者姓名： | 代黎明 牛成民 庞小军 冯冲 万琳 金小燕 |
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| 作者单位： | 中海石油(中国)有限公司天津分公司, 天津 300459 |
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| 基金项目： | 国家科技重大专项2016ZX05024-003 |
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| 摘 要： | 渤海海域黄河口凹陷BZ27-A（渤中27-A）构造沙一二段发育一套湖相混积岩，目前对该储层的特征及成因研究较少.通过岩心观察、铸体薄片、压汞测试等分析，系统阐述了该区混积岩储层的岩石学、储集空间类型、物性等特征，在此基础上探讨了混积岩储层控制因素.结果表明，混积岩岩性复杂多样，由陆源碎屑、黏土矿物、碳酸盐矿物及生物碎屑以多种组合方式混杂构成，发育钙质砂岩、白云质砂岩、陆屑泥晶云岩、泥晶鲕粒云岩、生物碎屑白云岩等类型，剖面上大多呈现夹层或薄互层的特点.多数混积岩储层孔隙度、渗透率低，为致密储层，局部薄层段发育相对较好储层.混积岩储层的发育主要受古地理背景、成岩作用、流体等因素影响，成岩早期大面积碳酸盐胶结是导致储层致密的主要成因，而生屑的贡献、晚期成藏时的油气侵位作用是改善储层物性的重要作用，具有形成相对优质储层的潜力.
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| 关 键 词： | 混积岩 储层特征 控制因素 优质储层 黄河口凹陷 沉积 油气 |
| 收稿时间： | 2020-03-06 |
Reservoir Characteristics and Forming Mechanisms of Lacustrine Mixed Sedimentary Rock of First and Second Members of Shahejie Formation in BZ27-A Structure,Huanghekou Sag |
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| Abstract: | There is a set of lacustrine mixed sedimentary rocks in the first and second members of Shahejie Formation(Es1-2) in BZ27-A structure in Huanghekou sag, Bohai Sea area. At present, the research on the characteristics and genesis of this reservoir is still weak. In this study, based on the core observation, casting thin section and mercury porosimetry, the characteristics of petrology, reservoir space type, physical property of mixed sedimentary rock reservoir are systematically described firstly, and then the controlling factors of the reservoir are put forward. The results show that the mixed sedimentary rock consists of terrigenous clastic, clay minerals, carbonate minerals and biodetritus. The lithology mainly includes calcareous sandstone, dolomitic sandstone, terrigenous clastic micrite dolomite, micrite oolitic dolomite and bioclastic dolomite, which are interbeded or thin interbeded in the vertical section. Most of the mixed sedimentary rock reservoirs are tight due to low porosity and permeability, with few relatively better reservoirs in thin intervals. The main factors controlling the mixed sedimentary rock reservoirs are paleogeographic background, provenance, diagenesis and fluid. Massive carbonate cementation in the diagenetic stage is the main cause of tight reservoir, however, the contributions of bioclastic, oil and gas emplacement in the later stage of hydrocarbon accumulation are important for improving the physical properties of reservoirs, and have the potential to form relatively high-quality reservoirs. |
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