Origin of conventional and shale gas in Sinian–lower Paleozoic strata in the Sichuan Basin: Relayed gas generation from liquid hydrocarbon cracking

AAPG Bulletin ◽  
2019 ◽  
Vol 103 (6) ◽  
pp. 1265-1296 ◽  
Author(s):  
Wenzhi Zhao ◽  
Shuichang Zhang ◽  
Kun He ◽  
Hongliu Zeng ◽  
Guoyi Hu ◽  
...  
Keyword(s):  
Shale Gas ◽  
Sichuan Basin ◽  
Liquid Hydrocarbon ◽  
Gas Generation ◽  
Lower Paleozoic ◽  
Hydrocarbon Cracking ◽  
The Sichuan Basin

scholarly journals Coupling between Source Rock and Reservoir of Shale Gas in Wufeng-Longmaxi Formation in Sichuan Basin, South China

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2679
Author(s):  
Yuying Zhang ◽  
Shu Jiang ◽  
Zhiliang He ◽  
Yuchao Li ◽  
Dianshi Xiao ◽  
...  
Keyword(s):  
Source Rock ◽  
Shale Gas ◽  
Sichuan Basin ◽  
Gas Content ◽  
Potential Zone ◽  
Hydrocarbon Generation ◽  
Gas Generation ◽  
Longmaxi Formation ◽  
Siliceous Shale ◽  
Organic Pores

In order to analyze the main factors controlling shale gas accumulation and to predict the potential zone for shale gas exploration, the heterogeneous characteristics of the source rock and reservoir of the Wufeng-Longmaxi Formation in Sichuan Basin were discussed in detail, based on the data of petrology, sedimentology, reservoir physical properties and gas content. On this basis, the effect of coupling between source rock and reservoir on shale gas generation and reservation has been analyzed. The Wufeng-Longmaxi Formation black shale in the Sichuan Basin has been divided into 5 types of lithofacies, i.e., carbonaceous siliceous shale, carbonaceous argillaceous shale, composite shale, silty shale, and argillaceous shale, and 4 types of sedimentary microfacies, i.e., carbonaceous siliceous deep shelf, carbonaceous argillaceous deep shelf, silty argillaceous shallow shelf, and argillaceous shallow shelf. The total organic carbon (TOC) content ranged from 0.5% to 6.0% (mean 2.54%), which gradually decreased vertically from the bottom to the top and was controlled by the oxygen content of the bottom water. Most of the organic matter was sapropel in a high-over thermal maturity. The shale reservoir of Wufeng-Longmaxi Formation was characterized by low porosity and low permeability. Pore types were mainly <10 nm organic pores, especially in the lower member of the Longmaxi Formation. The size of organic pores increased sharply in the upper member of the Longmaxi Formation. The volumes of methane adsorption were between 1.431 m3/t and 3.719 m3/t, and the total gas contents were between 0.44 m3/t and 5.19 m3/t, both of which gradually decreased from the bottom upwards. Shale with a high TOC content in the carbonaceous siliceous/argillaceous deep shelf is considered to have significant potential for hydrocarbon generation and storage capacity for gas preservation, providing favorable conditions of the source rock and reservoir for shale gas.

Hydrocarbon gas generation from pyrolysis of extracts and residues of low maturity solid bitumens from the Sichuan Basin, China

2017 ◽  
Vol 103 ◽  
pp. 51-62 ◽  
Author(s):  
Zixiang Wang ◽  
Yongli Wang ◽  
Baoxiang Wu ◽  
Gen Wang ◽  
Zepeng Sun ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Gas Generation ◽  
Hydrocarbon Gas ◽  
The Sichuan Basin

Quantitative prediction of oil and gas prospects of the Sinian-Lower Paleozoic in the Sichuan Basin in central China

Energy ◽  
2019 ◽  
Vol 174 ◽  
pp. 861-872 ◽  
Author(s):  
Wenyang Wang ◽  
Xiongqi Pang ◽  
Zhangxin Chen ◽  
Dongxia Chen ◽  
Tianyu Zheng ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Oil And Gas ◽  
Central China ◽  
Quantitative Prediction ◽  
Lower Paleozoic ◽  
The Sichuan Basin

scholarly journals Removal of Ca2+, Mg2+, Ba2+ and Sr2+ from shale gas flowback water from the Sichuan Basin in China by chemical softening under the guidance of OLI Stream Analyzer: precipitation behaviors and optimization study

2020 ◽  
Author(s):  
Wenshi Liu ◽  
Lingru Sun ◽  
Sha Tao
Keyword(s):  
Reverse Osmosis ◽  
Shale Gas ◽  
Sichuan Basin ◽  
System Analysis ◽  
Flowback Water ◽  
Optimization Study ◽  
Mineral Scaling ◽  
The Sichuan Basin ◽  
Reverse Osmosis Desalination ◽  
Chemical Softening

Abstract The disposal of flowback water is recognized as a key issue for the sustainable shale gas development and discharge after reasonable treatment is considered as a feasible pathway. One of the challenges during treatment is the severe mineral scaling potential in reverse osmosis desalination, especially with high amounts of Ca2+, Mg2+, Ba2+ and Sr2+ in flowback water. In this study, precipitation behaviors of Ca2+, Mg2+, Ba2+ and Sr2+ during traditional chemical softening was evaluated so as to achieve optimal chemical dosage. Both jar tests and OLI Stream Analyzer simulation revealed that the main precipitates were CaCO3, SrCO3 and BaSO4 during Na2CO3 addition, and Ba2+ could not be removed efficiently by Na2CO3 unless a high dosage was applied since Ba2+ would react after the precipitation of Ca2+ and Sr2+. Reverse Osmosis System Analysis simulation indicated that Ba2+ was a concern because Ba2+ would form tenacious BaSO4 scale on the reverse osmosis membranes. Finally, the Na2SO4-NaOH-Na2CO3 process was proposed for chemical softening as it has a high removal efficiency and low chemical cost. Overall, this study presents an effective chemical softening method and OLI Stream Analyzer could serve as a reliable tool for the calculation, which would finally improve the design and operation of shale gas flowback water treatment.

scholarly journals Shale gas generation and potential of the Lower Cambrian Qiongzhusi Formation in the Southern Sichuan Basin, China

2012 ◽  
Vol 39 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Jinliang HUANG ◽  
Caineng ZOU ◽  
Jianzhong LI ◽  
Dazhong DONG ◽  
Sheiiao WANG ◽  
...  
Keyword(s):  
Shale Gas ◽  
Lower Cambrian ◽  
Sichuan Basin ◽  
Gas Generation
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