Paleoenvironmental Modes and Organic Matter Enrichment Mechanisms of Lacustrine Shale in the Paleogene Shahejie Formation, Qikou Sag, Bohai Bay Basin

2021 ◽  
Author(s):  
Zhuoya Wu ◽  
Xianzheng Zhao ◽  
Jianzhong Li
Keyword(s):  
Organic Matter ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Qikou Sag ◽  
Shahejie Formation ◽  
Lacustrine Shale

scholarly journals Paleoenvironmental modes and organic matter enrichment mechanisms of lacustrine shale in the Paleogene Shahejie Formation, Qikou Sag, Bohai Bay Basin

2021 ◽  
Vol 7 ◽  
pp. 9046-9068
Author(s):  
Zhuoya Wu ◽  
Xianzheng Zhao ◽  
Jianzhong Li ◽  
Xiugang Pu ◽  
Xiaowan Tao ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Qikou Sag ◽  
Shahejie Formation ◽  
Lacustrine Shale

scholarly journals The influences of sedimentary environments on organic matter enrichment in fine-grained rocks of the Paleogene Shahejie formation in Nanpu Sag, Huanghua Depression, Bohai Bay Basin

2021 ◽  
pp. 014459872110310
Author(s):  
Min Li ◽  
Xiongqi Pang ◽  
Guoyong Liu ◽  
Di Chen ◽  
Lingjian Meng ◽  
...  
Keyword(s):  
Organic Matter ◽  
Source Rocks ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Humid Climate ◽  
High Productivity ◽  
Fine Grained ◽  
Huanghua Depression ◽  
Shahejie Formation ◽  
Nanpu Sag

The fine-grained rocks in the Paleogene Shahejie Formation in Nanpu Sag, Huanghua Depression, Bohai Bay Basin, are extremely important source rocks. These Paleogene rocks are mainly subdivided into organic-rich black shale and gray mudstone. The average total organic carbon contents of the shale and mudstone are 11.5 wt.% and 8.4 wt.%, respectively. The average hydrocarbon (HC)-generating potentials (which is equal to the sum of free hydrocarbons (S1) and potential hydrocarbons (S2)) of the shale and mudstone are 39.3 mg HC/g rock and 28.5 mg HC/g rock, respectively, with mean vitrinite reflectance values of 0.82% and 0.81%, respectively. The higher abundance of organic matter in the shale than in the mudstone is due mainly to paleoenvironmental differences. The chemical index of alteration values and Na/Al ratios reveal a warm and humid climate during shale deposition and a cold and dry climate during mudstone deposition. The biologically derived Ba and Ba/Al ratios indicate high productivity in both the shale and mudstone, with relatively low productivity in the shale. The shale formed in fresh to brackish water, whereas the mudstone was deposited in fresh water, with the former having a higher salinity. Compared with the shale, the mudstone underwent higher detrital input, exhibiting higher Si/Al and Ti/Al ratios. Shale deposition was more dysoxic than mudstone deposition. The organic matter enrichment of the shale sediments was controlled mainly by reducing conditions followed by moderate-to-high productivity, which was promoted by a warm and humid climate and salinity stratification. The organic matter enrichment of the mudstone was less than that of the shale and was controlled by relatively oxic conditions.

Paleosalinity and Its Association with Organic Matter: A Case Study from the Eocene Shahejie Formation, Laizhou Bay Sag, Bohai Bay Basin (China)

2021 ◽  
Vol 20 (4) ◽  
pp. 741-754
Author(s):  
Haoran Liang ◽  
Guosheng Xu ◽  
Qing Yu ◽  
Fanghao Xu ◽  
Deying Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Laizhou Bay ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Shahejie Formation

scholarly journals Characteristics of nanopores in terrestrial low-maturity shale based on organic-inorganic interactions: A case study on the Shahejie Formation shale in the southern Bohai Bay Basin, Eastern China

2020 ◽  
Vol 600 (1) ◽  
pp. 012007
Author(s):  
Fu Deliang ◽  
Sun Lina ◽  
Xu Guosheng ◽  
Liang Haoran ◽  
Zhang Chen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Area ◽  
Pore Diameter ◽  
Eastern China ◽  
Bet Surface Area ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Pore Characteristics ◽  
Inorganic Matter ◽  
Shahejie Formation

Abstract In this study, the influence of organic matter and inorganic matter on the pore structure of the Shahejie Formation (E2-3S) shale in the Bohai Bay Basin, was analysed. The pore characteristics, including the BET surface area, BJH adsorption cumulative volume and average pore diameter of the original samples, extracted samples, H2O2-treated samples and kerogen samples, were analysed with low-pressure N2 adsorption experiment. The study showed that the soluble organic matter in low-maturity shale blocked a certain number of pores, which mainly had pore sizes below 5 nm. The solid organic matter mainly formed pore diameters of 1-2 nm and pore diameters larger than 10 nm. A large amount inorganic pore diameter in the ranges of less than 0.8 nm, 1-2 nm, and 2.3-20 nm was blocked by solid organic matter. The micropores formed by minerals were much more abundant than those formed by organic matter in the terrestrial low-maturity shale. The symbiotic relationship between the minerals and the organic matter led to a decrease in the specific surface area and pore volume of the terrestrial low-maturity shale.

scholarly journals Gravity flow sedimentation and tight oil exploration in lower first member of Shahejie Formation in slope area of Qikou Sag, Bohai Bay Basin

2014 ◽  
Vol 41 (2) ◽  
pp. 153-164 ◽  
Author(s):  
Xiugang PU ◽  
Lihong ZHOU ◽  
Wenzhong HAN ◽  
Changwei CHEN ◽  
Xuanjun YUAN ◽  
...  
Keyword(s):  
Gravity Flow ◽  
Tight Oil ◽  
Bohai Bay ◽  
Oil Exploration ◽  
Bohai Bay Basin ◽  
Qikou Sag ◽  
Shahejie Formation
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