Depositional System, Plane Distribution and Exploration Significance of Fan-Delta Mixed Siliciclastic-Carbonate Sediments in Lacustrine Basin: An Example of Member 1-2 of Shahejie Formation in Offshore Bohai Bay, Eastern China

被引：0
|
作者：
Fu X. [1 ]
Du X. [1 ]
Guan D. [1 ]
Wang Q. [1 ]
Ye M. [2 ]
机构：
[1] Tianjin Branch of China National Offshore Oil Corporation Limited, Tianjin
[2] College of Marine Science and Technology, China University of Geosciences, Wuhan
来源：
| 1600年 / China University of Geosciences卷 / 45期
关键词：
Formation mechanism; Members 1-2 of Shahejie Formation; Mixed silicicastic-carbonate sediment; Offshore of Bohai Bay basin; Reservoir characteristics; Sedimentation;
D O I：
10.3799/dqkx.2020.173
中图分类号：
学科分类号：
摘要：
Mixed siliciclastic-carbonate sediments accompanied by fan-delta are well developed in the Members 1-2 of Palaeogene Shahejie Formation in the offshore Bohai Bay Basin. A study of core description, photomicrographic observation, and petrophysical properties were performed on the mixed sediment reservoirs in a lacustrine basin, attempting to unravel the depositional environment, formation mechanism, plane distribution and reservoir features of lacustrine mixed sediments. The results show that the main sub-facies within mixed fan-delta association contain mixed fan-delta front and mixed pro-fan delta. Fan-delta frontcan include mixed subaqueous debris flows genetic facies and mixed estuarine bar genetic facies. Pro-fan delta develops mixed pro-fan delta. Based on sedimentary characteristics and internal architectures of each genetic facies, the development model of mixed fan-delta siliciclastic-carbonate sediments in terrestrial rift-subsidence lacustrine basin is attributed to two aspects: the mechanism of fan-delta mixed sediments that is related to gravity driven-tractive and the mechanism of fan-delta mixed sediments that goes through a process of construction-destruction interbedding. This study characterizes the major reservoir characteristics of mixed sediments, providing insights into their advantages as a new kind of petroleum reservoir: (1) a mass of primary porosity has still been preserved in the mid-deep buried depth; (2) secondary porosities have been generated by selective dissolutions; (3) high content of carbonate content assists reservoirs acidification. This sedimentology and reservoir study is expected to facilitate future exploration in mid-deep reservoirs in the offshore Bohai Bay basin. © 2020, Editorial Department of Earth Science. All right reserved.
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页码：3706 / 3720
页数：14
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