Journal of Petroleum & Environmental Biotechnology

The characteristics of Wufeng-Longmaxi shale gas reservoir in Luochang syncline, South Sichuan basin

4^th International Conference on Petroleum Engineering

August 15-17, 2016 London, UK

Xu Zhengyu, Liang Xing, Xiong Shaoyun, Lu Huili and Xu He

PetroChina Hangzhou Research Institute of Petroleum Geology, China
Zhejiang Oilfield Company, China

Posters & Accepted Abstracts: J Pet Environ Biotechnol

Abstract:

Luochang Syncline is located in the Southeast Depression of Southern Sichuan basin in the upper Yangtze region, formed since Indosinian epoch, developed Lower Cambrian Qiongzhusi and Upper Ordovician �?? Lower Silurian Wufeng - Longmaxi group two sets of shale. The Wufeng - Longmaxi shale listed as main target layer of Zhaotong national shale gas demonstration area, developed during Guangxi Orogenic Movement. After the events of Indosinian, Yanshanian and Himalayan period, the shale deformation and reformation of the relatively weak, moderate burial, shale gas formation and preservation condition is good, thus the syncline becomes in the upper Yangtze region, South Sichuan shale gas core area of an important part. According to the characteristics of lithology, logging curve properties, mineral composition, organic matter and gas bearing property, and Wufeng - Longmaxi formation shale of the Syncline can be divided into three third-order sequences, three lithologic section, three type facies and four type sub-facies and various microfacies. Overall to deep water shelf facies depositional stage, rich organic shale section (section I) bearing gas is best, and subdivided into I1, I2 and I3, I4, I5 five layer. Integrated analysis of shale physical property and pressure coefficient of the syncline, Zhaotong demonstration area of shale gas mainly is preserved in the central area of the current residual synclinorium main part of deep shelf facies deposition, desserts are mainly enriched in the residual gas reservoir in syncline axial zone, the gas reservoir is vertically divided into the two sets of the bottom Longmaxi and Wufeng formation by Guanyinqiao limestone interlayer, after the combination of fracturing evaluation and single well production test results and evaluation that the construction-production area to the bottom of Longmaxi I3 and 14 laminated shales fracturing transformation and gas recovery effect best.

Biography :

Email: xuzy_hz@petrochina.com.cn