Fault structural characteristics of Wangfu Fault Depression and its effect on coal-rock gas enrichment, Songliao Basin, NE China

SUN Yonghe; LIU Yumin; TIAN Wenguang

doi:10.11698/PED.20240766

0 20250606 - 20250606

DOI: https://doi.org/10.11698/PED.20240766

Fault structural characteristics of Wangfu Fault Depression and its effect on coal-rock gas enrichment, Songliao Basin, NE China

SUN Yonghe ,
LIU Yumin ,
TIAN Wenguang

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1. School of Petroleum Engineering, Chongqing University of Science & Technology, Chongqing 401331, China;
2. School of Electronic and Electrical Engineering, Chongqing University of Science & Technology, Chongqing 401331, China;
3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China

Received date: 2024-12-11

Revised date: 2025-03-01

Online published: 2025-05-13

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Abstract

Taking the Wangfu Rift in the Songliao Basin as an example, on the basis of seismic interpretation and drilling data analysis, the distribution of the basement faults was clarified, the fault activity periods of the coal-bearing formations were determined, and the fault systems were divided. Combined with the coal seam thickness and actual gas indication in logging, the controls of fault systems in the rift basin on the spatial distribution of coal and the occurrence of coal-rock gas were identified. The results show that the Wangfu Rift is an asymmetrical graben formed under the control of basement reactivated strike-slip T-rupture, and contains coal-bearing formations and five sub-types of fault systems under three types. The horizontal extension strength, vertical activity strength and tectono-sedimentary filling difference of basement faults control vertical stratigraphic sequences, accumulation intensity, and accumulation frequency of coal seam in rift basin. The structural transfer zone formed during the segmented reactivation and growth of the basement faults control the injection location of steep slope exogenous clasts. The filling effect induced by igneous intrusion accelerates the sediment filling process in the rift lacustrine area. The structural transfer zone and igneous intrusion together determine the preferential accumulation location of coal seams in the plane. The faults reactivated at the basement and newly formed during the rifting phase serve as pathways connecting to the gas source, affecting the enrichment degree of coal-rock gas. The vertical sealing of the faults was evaluated by using shale smear factor (SSF), and the evaluation criteria was established. It is indicated that the SSF is below 1.1 in major coal areas, indicating favorable preservation conditions for coal-rock gas. Based on the influence factors such as fault activity, segmentation and sealing, the coal-rock gas accumulation model of rift basin was established.

Key words： coal-rock gas; rift basin; Songliao Basin; Wangfu Rift; structural characteristics; fault system; basement reactivation; Cretaceous; coal accumulation law; accumulation model

Cite this article

SUN Yonghe , LIU Yumin , TIAN Wenguang . Fault structural characteristics of Wangfu Fault Depression and its effect on coal-rock gas enrichment, Songliao Basin, NE China[J]. Petroleum Exploration and Development, 0 : 20250606 -20250606 . DOI: 10.11698/PED.20240766

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