Diagenesis Variation in Different Distributary Channels of Shallow Water Lacustrine Delta Deposits and Implication for High-Quality Reservoir Prediction: A Case Study in the Chang 8 Member in Caijiamiao Area, Sw Ordos Basin, China

被引:1
|
作者
Bi, Xiaolong [1 ,2 ]
Wang, Yiping [3 ]
Tang, Xiao [3 ]
Luo, Weiyun [3 ]
Hao, Chenxi [3 ]
Hou, Mingqiu [4 ]
Zhang, Li [1 ,2 ]
机构
[1] Yangtze Univ, Sch Geosci, Wuhan 430100, Peoples R China
[2] Hubei Engn Res Ctr Unconvent Petr Geol & Engn, Wuhan 430100, Peoples R China
[3] PetroChina Changqing Oilfield Co, Oil Prod Plant 2, Changqing, Peoples R China
[4] PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Ordos Basin; shallow water delta; diagenesis variation; reservoir prediction; TRIASSIC YANCHANG FORMATION; STAGE PLANE BEDS; SEDIMENT TRANSPORT; SICHUAN BASIN; POROSITY LOSS; SANDSTONE; FIELD; SAND; PERMEABILITY; DYNAMICS;
D O I
10.3390/min14100987
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Tight oil reservoirs are considered important exploration targets in lacustrine basins. High-quality reservoir prediction is difficult as the reservoirs have complex distributions of depositional facies and diagenesis processes. Previous research has found that the diagenesis process of tight oil sandstones varies greatly in different depositional facies. However, diagenesis variation in different depositional facies is still poorly studied, especially in distributary channels of shallow water delta deposits in lacustrine basins. Based on the description of core samples, the observation of rock slices, the interpretation of well logging data, and the analysis of porosity and permeability data, the differences in the lithofacies types, diagenesis processes, and pore structures of different distributary channels have been clarified. Ultimately, a model of diagenesis and reservoir heterogeneity distribution in the shallow-water delta of Chang 8 Member of the Yanchang Formation in the Caijiamiao area of the Ordos Basin has been established. This research indicates that the main distributary channels in the study area are dominated by massive bedding sandstone lithofacies, while the secondary distributary channels are primarily characterized by cross-bedding sandstone lithofacies. There are significant differences in the compaction, dissolution, and cementation of authigenic chlorite and carbonate among different parts of the distributary channels. Plastic mineral components, such as clay and mica, are abundant in sheet sands, and are more influenced by mechanical and chemical compaction. Influenced by the infiltration of meteoric water and hydrocarbon generation, dissolution pores are relatively well-developed in the underwater distributary channel reservoirs. A large amount of carbonate cementation, such as calcite and siderite, is found within the sandstone at the interface between sand and mud. The occurrence of authigenic chlorite exhibits a clear sedimentary microfacies zonation, but there is little difference in the kaolinite and siliceous cementation among different microfacies reservoirs. Finally, a model of diagenetic differences and reservoir quality distribution within dense sand bodies has been established. This model suggests that high-quality reservoirs are primarily developed in the middle of distributary channels, providing a theoretical basis for the further fine exploration and development of oil and gas in the study area.
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页数:22
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