Journal
ACS EARTH AND SPACE CHEMISTRY
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsearthspacechem.2c00065
Keywords
lacustrine shale; paleoenvironment; source rock potential; gas origin; Songliao Basin
Funding
- RIPED of Jilin Oil fi eld Branch, CNPC [42002167, 42130803, 42072174]
- National Natural Science Foundation of China [42002167, 42130803, 42072174]
- Natural Science Foundation of Chongqing, China [42002167, 42130803]
- Chongqing Education Commission of China [42072174]
- Chongqing University of Science and Technology [cstc2020jcyj-msxmX0487]
- Science and Technology Innovation Training Program for College Students of Chongqing, China [cstc2021jcyj-msxmX0733]
- Coal Mining Research Branch [KJQN202101530]
- [182001003]
- [s202111551013]
- [KJ-2019-TDKCMS-03]
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Numerous large gas fields with large proven reserves occur in the deep formations of Songliao Basin, NE China. However, challenges exist regarding the study of the main source rock and the controversial origins and genetic types of natural gases. This study addresses these problems through research on paleoenvironments, organic matter sources, source rock potential, gas origin and genetic type, and gas-source correlations. The findings suggest that the deep formations of Songliao Basin have significant potential for gas exploration.
ABSTRACT: Numerous large gas fields with large proven reserves occur in the deep formations of Songliao Basin, NE China. However, some challenges remain as follows: (1) the main source rock is poorly studied and (2) the origins and genetic types of the natural gases are controversial. In this study, these problems can be addressed by the research of the paleoenvironments during shale deposition, the organic matter sources, the source rock potential, the gas origin and genetic type, and gas-source correlations. The redox conditions of the water column during the Huoshiling to Yingcheng depositions were transitional (suboxidizing to subreducing) environments, and the Huoshiling deposition corresponded to reducing conditions. The paleosalinity of water was brackish to fresh from Huoshiling to Yingcheng depositions. The organic matters of the Huoshiling-Yingcheng shales mainly originated from terrigenous and/or lacustrine materials. The shales are evaluated as the fair to good source rock potential, and the Huoshiling is the best. The gases in the Huoshiling and Shahezi were mainly organic and thermogenic origins, with some inorganic origins. The gases of organic origins are mainly the mixed sources of coal-derived and oil-associated gases and are predominant products of secondary cracking, suggesting the well gas exploration potential in deep formations of Songliao Basin. The gases in the Shahezi formation are predominantly sourced by the Shahezi shales, indicating an approaching-source accumulation.
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