Petroleum Exploration and Development >

2017 , Vol. 44 >Issue 5: 659 - 669

DOI: https://doi.org/10.11698/PED.2017.05.01

PETROLEUM EXPLORATION

Discovery of Wanyuan-Dazhou Intracratonic Rift and its exploration significance in the Sichuan Basin, SW China

  • ZHAO Wenzhi ,
  • WEI Guoqi ,
  • YANG Wei ,
  • MO Wuling ,
  • XIE Wuren ,
  • SU Nan ,
  • LIU Mancang ,
  • ZENG Fuying ,
  • WU Saijun
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  • PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received date: 2016-12-30

  Revised date: 2017-07-07

  Online published: 2017-09-18

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Abstract

With the development of gas exploration of the Sinian-Cambrian strata in the Sichuan Basin, creative understandings of geology were achieved. An N-E trending intracratonic rift was found in the Wanyuan-Dazhou area, northeastern Sichuan Basin. Based on seismic interpretation data, outcrop data and analysis of regional structural geological background, studies on the boundary, distribution, formation and evolution history of Wanyuan-Dazhou rift were carried out, and the significance on exploration was discussed. The following findings were obtained. (1) The seismic section indicated that a steep-slope belt was developed in the first and second members (Z2dn1-Z2dn2) of the Dengying Formation of the Sinian System, showing platform edge facies. The rift generally strikes in NE direction. (2) The thicknesses of the first and second members of the Dengying Formation are thicker than the third and fourth members (Z2dn3-Z2dn4) at the rift periphery, while it came to the opposite conclusion at the inside of the rift. (3) The rift formed in Z2dn1-Z2dn2 of Sinian deposition period. Filling and subsidence occurred in Z2dn3-Z2dn4 of Sinian deposition period. The shrinkage stage was the deposition period of the Early Cambrian Maidiping Formation - Qiongzhusi Formation. The formation of the rift was controlled by the Nanhua rift and regional uplift. The finding of the Wanyuan-Dazhou rift changed the traditional understanding of the Sinian - Early Cambrian tectonic sedimentary framework, and the rift will be the significant exploration direction in the future due to its superior natural gas accumulation conditions in the Sinian.

Key words： Sichuan Basin; Northeastern Sichuan; Wanyuan-Dazhou; Sinian-Early Cambrian; intracratonic rift; lithofacies paleogeography; tectonic movement

Cite this article

ZHAO Wenzhi , WEI Guoqi , YANG Wei , MO Wuling , XIE Wuren , SU Nan , LIU Mancang , ZENG Fuying , WU Saijun . Discovery of Wanyuan-Dazhou Intracratonic Rift and its exploration significance in the Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2017 , 44(5) : 659 -669 . DOI: 10.11698/PED.2017.05.01

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