Palaeolake Environment and Depositional Model of Source Rocks of the Lower Submember of Sha1 in Raoyang Sag, Bohai Bay Basin

被引：5
作者：
Yin J. [1 ]
Wang Q. [2 ]
Hao F. [3 ,4 ]
Guo L. [2 ]
Zou H. [1 ]
机构：
[1] College of Geosciences, China University of Petroleum, Beijing
[2] Exploration and Development Research Institute of PetroChina Huabei Oilfield Company, Renqiu
[3] Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan
[4] China University of Petroleum, Qingdao
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2017年 / 42卷 / 07期
关键词：
Development model; High-quality source rock; Paleolake; Petroleum geology; Raoyang sag; The lower submember of Sha1;
D O I：
10.3799/dqkx.2017.098
中图分类号：
学科分类号：
摘要：
Despite successful studies on source rocks of Raoyang sag, existing studies on the ancient lake environment during lower submember of Sha1 source rocks development period are not systematic, an important factor controlling the geochemical characteristics and temporal and spatial distribution of source rocks, is often ignored. In this study, samples of source rocks in the lower submember of Sha1 were analyzed with palaeontological material, organic geochemistry, trace element and isotopic geochemistry to reveal the paleolake environment including the paleoclimate, water depth, salinity, organic matter preservation and productivity, and to construct depositional model for high-quality source rocks of the lower submember of Sha1. Results show that the high-quality source rocks mainly formed in the transgressive system tracts period. Meantime, the climate was in the transition from arid to humid, and the water depth of the paleolake was about 2-14 meters, wave base depth was 7.5 meters. Paleosalinity parameters such as Sr/Ba and B/Ga indicate the lower submember of Sha1 belonged to the saline environment due to the effect of water evaporation. High salinity was favorable to stable halocline formation, resulting in the bottom water in an anoxic condition for the preservation of organic matter. And the stable carbon isotope and nutrient elements distribution characteristics display that the surface water had high initial productivity in the stage of the lower submember of Sha1. Such paleolake environment caused wide distribution of strong reducing salt water semi-deep lake organic facies, beneficial to the growth of high-quality hydrocarbon source rocks. © 2017, Editorial Department of Earth Science. All right reserved.
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页码：1209 / 1222
页数：13
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