Discussion on the Genesis and Exploration Potential of Different Microscopic Forms of Organic Matters in the Longmaxi Formation Shale

LIU Zhen-zhuang; BAI Ming-gang; YANG Yu-ru; ZHANG Cong; WANG Xiang-hua; CHEN Juan; XIE Ting; FANG Li-yu; QIN Li-juan

doi:10.15898/j.cnki.11-2131/td.201907110100

Rock and Mineral Analysis > 2020 > 39(2): 199-207. > DOI: 10.15898/j.cnki.11-2131/td.201907110100

LIU Zhen-zhuang, BAI Ming-gang, YANG Yu-ru, ZHANG Cong, WANG Xiang-hua, CHEN Juan, XIE Ting, FANG Li-yu, QIN Li-juan. Discussion on the Genesis and Exploration Potential of Different Microscopic Forms of Organic Matters in the Longmaxi Formation Shale[J]. Rock and Mineral Analysis, 2020, 39(2): 199-207. DOI: 10.15898/j.cnki.11-2131/td.201907110100

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Discussion on the Genesis and Exploration Potential of Different Microscopic Forms of Organic Matters in the Longmaxi Formation Shale

1.
School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China
2.
The Key Laboratory of Unconventional Oil&Gas Geology Center, China Geological Survey, Beijing 100029, China
3.
Oil&Gas Survey Center, China Geological Survey, Beijing 100029, China

More Information

Received Date: July 10, 2019
Revised Date: August 14, 2019
Accepted Date: October 20, 2019
Published Date: February 29, 2020

Abstract

HIGHLIGHTS
(1) The microscopic morphology of organic matter in shale of the Longmaxi Formation in Sichuan Basin and its periphery was summarized.

(2) The genesis, internal structure and composition characteristics of three different microscopic forms of organic matter were discussed.

(3) The interstitial migration organic matter and the differentiated symbiotic organic matter were the main types of organic matter and the parent material of hydrocarbon generation in shale of the Longmaxi Formation.

ABSTRACT

BACKGROUNDOrganic matter is the most important component in shale, and organic pore is an important reservoir space of shale gas. Scanning electron microscope (SEM), the mainstream microscopic analysis and detection technology, has become an important means of shale research. The comprehensive study of organic matter is gradually becoming an important part of shale gas exploration and development.
OBJECTIVESTo summarize the microscopic morphology of organic matter in organic shale of the Longmaxi Formation and discuss its hydrocarbon generation and reservoir ability according to its internal structure and composition characteristics.
METHODSThe organic shale of the Longmaxi Formation in Sichuan Basin and its periphery were polished with argon ion, and the samples were examined by high resolution field emission scanning electron microscope under the condition of low voltage and close working distance.
RESULTSThere were three main microscopic forms of organic matter in the organic shale of the Longmaxi Formation, which were structure-type sedimentary organic matter, differentiated symbiotic organic matter and interstitial migration organic matter. The structural sedimentary organic matter formed in the stage of sedimentation and early diagenetic evolution, and retained some biological structure characteristics or sedimentary directional structure. Differentiated symbiotic organic matter interacted with clay minerals and underwent evolutionary differentiation, forming a 'granitic structure' similar to that in magmatic rocks. On the other hand, the interstitial migration organic matter was formed in the high evolution stage of late diagenetic organic matter, and the liquid hydrocarbon filled in the intergranular of authigenic minerals, and the surrounding minerals had euhedral characteristics. The shale of the Longmaxi Formation was dominated by organic matter pores-rich interstitial migration organic matter and differentiated symbiotic organic matter, which were the high-quality gas parent materials of the Longmaxi Formation shale, with high reservoir performance.
CONCLUSIONSThe research results provide deep-level micro-information for the theory of shale gas formation and the evaluation of exploration and development in the Longmaxi Formation in China.

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References (27)

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