Sedimentary environment of Shahejie Formation in Chezhen Sag, Bohai Bay Basin, China

2021 ◽  
Vol 14 (20) ◽  
Author(s):  
Lingling Wang ◽  
Jinliang Zhang ◽  
Yuanpei Zhang
Keyword(s):  
Sedimentary Environment ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Shahejie Formation

scholarly journals Analysis of Sedimentary Environment Conditions for Lacustrine Fine-Grained Sedimentary Rocks and Its Control of Lithofacies Development: A Case Study of the Lower Submember of Member 3 of Shahejie Formation in FY-1 Well, Dongying Sag, Bohai Bay Basin, China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Jun Peng ◽  
Ledan Yu ◽  
Tianyu Xu ◽  
Yubin Wang ◽  
Haodong Han
Keyword(s):  
Saline Water ◽  
Sedimentary Environment ◽  
Geochemical Data ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Fine Grained ◽  
Dongying Sag ◽  
Shahejie Formation ◽  
Three Stages ◽  
The Relationship

In recent years, the studies on fine-grained sedimentation mainly focus on the rock type, sedimentary environment, sedimentation, and sequence stratigraphy, while those on the relationship between sedimentary environment and lithofacies development are rare. However, a clear understanding on the relationship is of great significance to the muddy shale oil and gas exploration. This paper studied the muddy shale of semideep and deep lacustrine facies in the lower submember of Member 3 of Shahejie Formation in FY-1 Well, Dongying Sag, Bohai Bay Basin, East China. Based on geochemical data, the sedimentary environment media conditions and vertical changes of this submember were analyzed by means of core description, thin section authentication, X-ray diffraction (XRD), and other technologies, and the relationship between sedimentary environment and lithofacies development was discussed. The results show that this environment underwent three stages and is featured by cyclicity. From the bottom up, it experienced the semideep, deep, and deep/semideep waters under the relatively dry-cold/relatively warm-wet, warm-wet, and warm-wet/relatively warm-wet paleoclimates, respectively. Correspondingly, the paleoredox transited three stages from reducibility to high reducibility to high reducibility/reducibility; the paleosalinity changed from saline water to brackish water to brackish/saline water. Paleoproductivity was low/relatively high at the beginning, then became high, and finally relatively high. In this submember, the lithofacies primarily includes organic-rich mudstone, organic-rich lime mudstone, organic-rich lime-bearing mudstone, and organic-contained argillaceous limestone/lime mudstone. The sedimentary environment controls the mineral composition and content in the lithofacies and thus determines the lithofacies types. Meanwhile, the cyclicity of environmental change not only leads to that of the lithofacies development but also affects the positions of the lithofacies and its assemblages in sequence stratigraphic framework.

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.

The lithologic differences between the third and fourth members of the Eocene Shahejie Formation in the Bohai Bay Basin and the associated climatic evolution

2017 ◽  
Vol 53 (3) ◽  
pp. 788-802 ◽  
Author(s):  
Liangjun Wu ◽  
Fukui Wang ◽  
Dehai Wang ◽  
Mao Fu ◽  
Yuhua Jia
Keyword(s):  
Bohai Bay ◽  
Bohai Bay Basin ◽  
The Third ◽  
Shahejie Formation ◽  
Climatic Evolution

A three-dimensional high-resolution reservoir model of the Eocene Shahejie Formation in Bohai Bay Basin, integrating stratigraphic forward modeling and geostatistics

2017 ◽  
Vol 82 ◽  
pp. 362-370 ◽  
Author(s):  
Xiangdong Yin ◽  
Shuangfang Lu ◽  
Pengfei Wang ◽  
Qiming Wang ◽  
Wei Wang ◽  
...  
Keyword(s):  
High Resolution ◽  
Three Dimensional ◽  
Forward Modeling ◽  
Bohai Bay ◽  
Reservoir Model ◽  
Bohai Bay Basin ◽  
Shahejie Formation

Depositional model for lacustrine nearshore subaqueous fans in a rift basin: The Eocene Shahejie Formation, Dongying Sag, Bohai Bay Basin, China

Sedimentology ◽  
2018 ◽  
Vol 65 (6) ◽  
pp. 2117-2148 ◽  
Author(s):  
Yingchang Cao ◽  
Yanzhong Wang ◽  
Jonathan Gordon Gluyas ◽  
Huimin Liu ◽  
Haining Liu ◽  
...  
Keyword(s):  
Bohai Bay ◽  
Depositional Model ◽  
Rift Basin ◽  
Bohai Bay Basin ◽  
Dongying Sag ◽  
Shahejie Formation

Low Contrast Pay Identification in the Shahejie Formation, Bohai Bay Basin, East China

2019 ◽  
Author(s):  
Y. Cui ◽  
G. Wang ◽  
X. Fan ◽  
H. Zhao
Keyword(s):  
East China ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Low Contrast ◽  
Shahejie Formation

Rock Types and Reservoir Characteristics of Shahejie Formation Marl in Shulu Sag, Jizhong Depression, Bohai Bay Basin

2021 ◽  
Vol 32 (4) ◽  
pp. 986-997
Author(s):  
Jingwei Cui ◽  
Xuanjun Yuan ◽  
Songtao Wu ◽  
Ruifeng Zhang ◽  
Song Jin ◽  
...  
Keyword(s):  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Reservoir Characteristics ◽  
Rock Types ◽  
Shulu Sag ◽  
Shahejie Formation ◽  
Jizhong Depression
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