Enrichment model of shale gas in southeastern Sichuan Basin: a case study of Upper Ordovician Wufeng and Lower Silurian Longmaxi formations in Dingshan area

NI Kai; WANG Mingfa; LI Xiang

doi:10.11781/sysydz202104580

Volume 43 Issue 4

Jul. 2021

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NI Kai, WANG Mingfa, LI Xiang. Enrichment model of shale gas in southeastern Sichuan Basin: a case study of Upper Ordovician Wufeng and Lower Silurian Longmaxi formations in Dingshan area[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(4): 580-588. doi: 10.11781/sysydz202104580

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Enrichment model of shale gas in southeastern Sichuan Basin: a case study of Upper Ordovician Wufeng and Lower Silurian Longmaxi formations in Dingshan area

doi: 10.11781/sysydz202104580

SINOPEC Exploration Company, Chengdu, Sichuan 610041, China

Received Date: 2020-09-09
Rev Recd Date: 2021-05-31
Publish Date: 2021-07-28

Abstract

Abstract

Based on the understanding of the basic geological conditions of shale gas from the Upper Ordovician Wufeng Formation to the Lower Silurian Longmaxi Formation in Dingshan area of the southeastern Sichuan Basin, the occurrence, migration mode and intensity of natural gas in the shale gas system were discussed according to the results of drilling, logging, fracturing test, laboratory test and structural interpretation, moreover, a shale gas enrichment mode suitable for the study area was proposed. In shale gas systems, high-angle fractures extend for a short distance, while horizontal fractures such as bedding-parallel detachment and interlayer bedding fractures extend for a long distance. As a result, the permeability in the bedding direction is much greater than that in the vertical direction. These characteristics together determined that natural gas in shale gas system was usually transported horizontally, and sometimes both horizontally and vertically. For the Qiyueshan fault zone, the burial depth of shale reservoir and the distance to Qiyueshan fault zone are the major constrains for shale gas enrichment in the Wufeng-Longmaxi formations in the study area. The Qiyueshan fault zone is a basin-controlling fault zone with fractures and associated fractures developed, and is a shale gas escaping area. In the shallow-buried area in the southeastern part, high-angle fractures were relatively developed, by which horizontal fractures were opened. The proportion of free gas was less than 60%. A normal pressure system indicates a semi-retention area for shale gas. In the middle-to deep-buried area in the northwest, high-angle fractures were relatively undeveloped, and horizontal fractures were closed. The vertical and horizontal migrations were blocked, and most of shale gas was trapped in shale reservoirs. The proportion of free gas is more than 60%. A high-to ultra-high pressure system indicates a shale gas accumulation area.
- horizontal migration,
- enrichment,
- escape,
- shale gas,
- Wufeng-Longmaxi formations,
- Dingshan area,
- Sichuan Basin

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Enrichment model of shale gas in southeastern Sichuan Basin: a case study of Upper Ordovician Wufeng and Lower Silurian Longmaxi formations in Dingshan area

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Enrichment model of shale gas in southeastern Sichuan Basin: a case study of Upper Ordovician Wufeng and Lower Silurian Longmaxi formations in Dingshan area

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