Evolution mechanism of Pinghu Formation coal-measure source rock from the Xihu Sag, East China Sea basin: Evidence from carbon isotopic evolution of kerogen, oil, and gas during hydrous pyrolysis

2021 ◽  
Author(s):  
Qiang Cao ◽  
Jiaren Ye ◽  
Yongchao Lu ◽  
Yang Tian ◽  
Jinshui Liu ◽  
...  
Keyword(s):  
East China Sea ◽  
Source Rock ◽  
Oil And Gas ◽  
Coal Measure ◽  
East China ◽  
Evolution Mechanism ◽  
China Sea ◽  
Carbon Isotopic ◽  
Hydrous Pyrolysis ◽  
Isotopic Evolution

Simulation of hydrocarbon generation and expulsion for the dark mudstone with Type-Ⅲ kerogen in the Pinghu Formation of Xihu Sag in East China Sea Shelf Basin

2021 ◽  
Author(s):  
Chenjie Xu
Keyword(s):  
East China Sea ◽  
Source Rock ◽  
Open System ◽  
Oil And Gas ◽  
East China ◽  
Hydrocarbon Generation ◽  
Gas Generation ◽  
China Sea ◽  
East China Sea Shelf ◽  
Oil And Gas Resources

<p>In order to finely describe the hydrocarbon generation and expulsion process of source rocks and provide reasonable key parameters for quantitative evaluation of oil and gas resources, we carried out a simulation research under semi-open system on hydrocarbon generation and expulsion for the dark mudstone with Type-Ⅲ kerogen in the Eocene Pinghu Formation in the Xihu Sag, East China Sea Shelf Basin. The results show that the process of hydrocarbon generation and expulsion can be divided into five stages as follows:</p><ul><li><em>R</em><sub>o</sub> = 0.5%~0.7%, oil was generated slowly without expulsion;</li> <li><em>R</em><sub>o</sub> = 0.7%~1.0%, oil was generated and expelled rapidly;</li> <li><em>R</em><sub>o</sub> = 1.0%~1.5%, oil began to be cracked into hydrocarbon gas;</li> <li><em>R</em><sub>o</sub> = 1.5%~2.3%, gas generation predominated;</li> <li><em>R</em><sub>o </sub>> 2.3%, only dry gas was generated.</li> </ul><p>Oil expulsion threshold (<em>R</em><sub>o</sub>) of the source rock of this type is about 0.7% (<em>R</em><sub>o</sub> = 0.7%), having a wide gas-window of <em>R</em><sub>o</sub> = 1.0%~3.0%. So it can maintain relatively strong gas generation ability at high- and over-mature stages, belonging to gas-prone source rock. Following the study on experimental results and the characteristics of hydrocarbon generation and expulsion in samples, we established a set of mathematical models for the evaluation of the process and potential of gas generation and oil generation and expulsion of the dark mudstone with Type-Ⅲ kerogen in the study area. Compared with the thermal simulation experiment in a closed system, the cumulative yield of oil in the semi-open system is higher and closer to that under actual geological conditions. Accordingly, we may conclude that more oil and gas resources may exist in the Xihu Sag.</p>

Quiet Struggle in the East China Sea

2002 ◽  
Vol 101 (656) ◽  
pp. 271-277 ◽  
Author(s):  
Selig S. Harrison
Keyword(s):  
East China Sea ◽  
Oil And Gas ◽  
Northeast Asia ◽  
East China ◽  
Eastern Siberia ◽  
The East China Sea ◽  
China Sea ◽  
Oil And Gas Pipelines ◽  
Petroleum Resources ◽  
Gas Fields

Growing attention has been devoted in recent years to projected oil and gas pipelines that would link Russian gas fields in eastern Siberia and Sakhalin Island to China, Japan, and the two Koreas. By contrast, there is little awareness of the high economic and political stakes involved in the quiet struggle now unfolding in Northeast Asia over seabed petroleum resources, especially the conflict between China and Japan over the East China Sea.

scholarly journals Petrology and hydrocarbon significance of the coaly source rocks from the Pinghu Formation in the Xihu Sag, East China Sea Shelf Basin

2020 ◽  
Vol 38 (5) ◽  
pp. 1295-1319
Author(s):  
Jinshui Liu ◽  
Shilong Kang ◽  
Wenchao Shen ◽  
Lanzhi Qin ◽  
Qianyu Zhou ◽  
...  
Keyword(s):  
East China Sea ◽  
Oil And Gas ◽  
Liquid Hydrocarbon ◽  
Source Rocks ◽  
East China ◽  
Lower Amount ◽  
Hydrocarbon Generation ◽  
Total Hydrocarbon ◽  
China Sea ◽  
East China Sea Shelf

The Xihu Sag in the East China Sea Shelf Basin contains abundant oil and gas reserves and is a focus for hydrocarbon exploration and development. Source rocks are mainly coals and coal-measures mudstones in the Paleogene Pinghu and Huagang formations. Samples from the Pinghu Formation in the Xihu Sag were collected for petrology, total organic carbon, and Rock-Eval analysis for the purpose of investigating macerals component and their contributions to hydrocarbon generation potential. The coaly source rocks from the Pinghu Formation are dominated by vitrinite (average 86.18%) but have an obviously elevated content of liptinite (average 12.59%) and a much lower amount of inertinite (average 1.23%). Liptinite of the samples is mainly composed of resinite, with a small amount of cutinite, sporinite and alginate in descending order. TOC values are 37.55%–65.58% (average 49.16%). Effective HI values are 167–281 mg HC/g TOC (average 223.5 mg HC/g TOC), suggesting the organic matter is type II kerogen. Relatively high HI values and macerals components suggest that the coaly source rocks can generate both oil and gas. Although the liptinite in the coaly source rocks has a content lower than vitrinite values, it makes a significant contribution to both total hydrocarbon and liquid hydrocarbon generation. The contributions of vitrinite, liptinite and inertinite to the total hydrocarbon generation approximately are 63.21%, 36.46% and 0.33%, respectively. The contributions of vitrinite and liptinite to the liquid hydrocarbon generation are approximately 40.95% and 59.05%, respectively. These results demonstrate that the coaly source rocks are dominated by vitrinite macerals with a relatively higher content of liptinite macerals, especially resinite, and these source rocks are more prone to both total hydrocarbon and liquid hydrocarbon generation. Paleogene coaly source rocks from other parts of the world should be considered for their oil-prone nature.

scholarly journals Defining stratigraphic oil and gas plays by modifying structural plays: A case study from the Xihu Sag, east China Sea Shelf Basin

2021 ◽  
Vol 2 (1) ◽  
pp. 41-51
Author(s):  
Feng Ding ◽  
Chunyu Xie ◽  
Xinghai Zhou ◽  
Cen Jiang ◽  
Kun Li ◽  
...  
Keyword(s):  
East China Sea ◽  
Oil And Gas ◽  
East China ◽  
China Sea ◽  
East China Sea Shelf

scholarly journals Genesis, source and charging of oil and gas in Lishui sag, East China Sea Basin

2014 ◽  
Vol 41 (5) ◽  
pp. 574-584 ◽  
Author(s):  
Ao SU ◽  
Honghan CHEN ◽  
Laisheng CAO ◽  
Mingzhu LEI ◽  
Cunwu WANG ◽  
...  
Keyword(s):  
East China Sea ◽  
Oil And Gas ◽  
East China ◽  
China Sea ◽  
East China Sea Basin

Cenozoic Tectonic Evolution and Controlling Factor on Hydrocarbon Accumulation in the Southern East China Sea Shelf Basin

2013 ◽  
Vol 416-417 ◽  
pp. 1908-1913
Author(s):  
Ying Bai ◽  
Hong Liang Wang ◽  
Qian Ru Li ◽  
Peng Wu
Keyword(s):  
East China Sea ◽  
Oil And Gas ◽  
Petroleum Exploration ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Control Factors ◽  
Study Results ◽  
East China Sea Shelf ◽  
Southern East China Sea

The East China Sea shelf basin, which is a fault subsidence during the Cenozoic Era, locates in the East China Sea continental shelf. In this paper, balanced section technique has been applied to analyzing the differential evolution in the East China Sea shelf basin south of Cenozoic tectonic and summarizing the control factors of tectonic activities on the petroleum accumulation. Our study results will provide essential data and basis for the distribution of the Cenozoic oil and gas and promote the development of the petroleum exploration in the East China Sea shelf basin.

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