Petroleum Exploration and Development >

2016 , Vol. 43 >Issue 1: 1 - 11

DOI: https://doi.org/10.11698/PED.2016.01.01

Orignal Article

Tectonic evolution from Late Sinian to Early Paleozoic and natural gas exploration in northwestern Sichuan Basin, SW China

  • GU Zhidong ,
  • YIN Jifeng ,
  • JIANG Hua ,
  • ZHANG Baomin ,
  • LI Qiufen ,
  • YUAN Miao ,
  • ZHAI Xiufen ,
  • ZHANG Li ,
  • YANG Fan
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  • PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Online published: 2017-01-01

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Abstract

Based on the field outcrops, drilling and seismic data of northwestern Sichuan Basin, this paper systematically discusses tectonic evolution characteristics from the Late Sinian to the Early Paleozoic, analyzes the petroleum geology significance, and points out the recent favorable exploration directions in this area. The area experienced mainly three times of tectonic evolution during the Late Sinian to the Early Paleozoic: (1) During the Late Sinian to the early period of Early Cambrian, this area was affected by tension action and formed two sets of nearly north-south trending continental rifts, and two sets of platform margins in the Sinian Dengying Formation. (2) During the middle period of the Early Cambrian to the Middle Ordovician, this area was eroded strongly (stronger in the northwest than in the southeast) because of multi-period uplifting of the northwestern Bikou paleo-land. (3) During the Late Ordovician to the Late Silurian, this area was eroded strongly again because of the compression of the Kwangsian Orogeny, and the erosion was stronger in the southwest than in the northeast. During the Late Sinian to the Early Cambrian, the formation of continental rifts controlled the development of bioherm beach facies reservoirs on the platform margins in the Dengying Formation and the high quality source rock in the Lower Cambrian series. During the middle of the Early Cambrian, the uplifting of the Bikou paleo-land controlled the distribution of the Kongmingdong Formation oolitic beach facies reservoirs around the paleo-land. It is suggested that, vertically, the fourth Member of the Dengying Formation and the Kongmingdong Formation be the main exploration targets, and, horizontally, the Jiulongshan structural trap be the most beneficial exploration belts recently due to its matching with petroleum migration and accumulation.

Key words： Sichuan Basin; Late Sinian - Early Paleozoic; tectonic evolution; natural gas exploration; intracontinental rift; Bikou paleo-land; Dengying Formation; Kongmingdong Formation; Jiulongshan structure

Cite this article

GU Zhidong , YIN Jifeng , JIANG Hua , ZHANG Baomin , LI Qiufen , YUAN Miao , ZHAI Xiufen , ZHANG Li , YANG Fan . Tectonic evolution from Late Sinian to Early Paleozoic and natural gas exploration in northwestern Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2016 , 43(1) : 1 -11 . DOI: 10.11698/PED.2016.01.01

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