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- Title
四川盆地德阳—安岳裂陷晚震旦世—早寒武世 沉积演化特征与有利勘探方向.
- Authors
谢武仁; 姜 华; 马石玉; 汪泽成; 郝 涛; 付小东; 苏 楠; 李文正; 武赛军; 王小丹; 黎 荣
- Abstract
The discovery of Anyue giant gas field has promoted the research on in-plate fracture dynamics and sedimentary filling process, but the current understanding of the origin and revolution of Deyang-Anyue Rift remains controversial. By interpreting large amounts of seismic data and combining latest drilling data, this paper systematically studied the origin, revolution and sedimentary filling characteristics of the rift and identified favor⁃ able exploration zones. The conclusions are as follows: Deyang-Anyue Rift was formed during Late Sinian-Early Cambrian epoch, with a differential evolution characteristic of“sedimentation in the north, erosion in the south”. The rift fractured from north to south, and platform margins were developed in the second member of Dengying Formation in Mianyang-Penglai-Dazu-Ziyang region. In the fourth member of Dengying Formation, the rift further extended south to Luzhou area. In the late depositional stage of Dengying Formation, the north⁃ ern part of the rift went through sedimentation, and the southern part went through uplift and denudation, resulting in erosion of the third and fourth members of Dengying Formation in some areas. In the late depositional stage of Dengying Formation, the sedimentation volume of the northern part of Deyang-Anyue Rift was bigger than that of the southern part, and the deposition center was located in Mianyang-Chengdu region. During the late depositional stage of Maidiping Formation, sedimentation continued in the northern part and occurred in the southern part. In the depositional period of Qiongzhusi Formation, two deposition centers were formed, with Mianyang-Chengdu in the South and Yibin-Luzhou in the North. Three types of reservoirs related to platform margins were developed, including erosion type, aggradation type and retrogradation type. Combined with the thick source rocks of Maidiping-Qiongzhusi formations, two favorable exploration zones were developed in Penglai-Laoguanmiao of Jiange region and Ziyang-Weiyuan region, the exploration area of which reaches 30 000 km².
- Subjects
CHENGDU (China); DIFFERENTIAL evolution; SEDIMENTATION &; deposition; GAS giants; EROSION; ROCK deformation; RIFTS (Geology)
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 8, p1240
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.03.012