Results 21 to 30 of about 4,225,085 (180)

Study on the Wellbore Instability Mechanism in the Longtan Formation with Soft/Hard Thin Interlayers in the South Sichuan Basin

Processes
The lithology of the transitional facies of the Longtan Formation in the southern Sichuan Basin is complex, with soft/hard thin interlayers of mud shale, sandstone, and limestone. Drilling this layer often results in wellbore instability, including frequent blockages, tripping resistance, and sticking.
Guo, Jianhua, Sang, Yu, Meng, Beiqiao, Xia, Lianbin, Wang, Yangsong, Ma, Chengyu, Tan, Tianyi, Yang, Bin   +7 more
openaire   +2 more sources

Sequence Stratigraphic Framework and Coal Accumulation of the Lopingian Longtan Formation in the Sichuan Basin, South China

Geological Journal
ABSTRACT The Lopingian Longtan Formation in the Sichuan Basin is a representative coal‐bearing succession deposited in a marine–continental transitional setting. Pronounced lateral variability in depositional environments and the subtle expression of sequence‐stratigraphic surfaces have, however, led to continued debate over the ...
Yangkai Su, Song Li, Xinyuan Li, Hanmiao Zhou, Chuang Chang, Liuyuan Zhang   +5 more
openaire   +2 more sources

Hydrocarbon Generation and Expulsion Histories of the Upper Permian Longtan Formation in the Eastern Sichuan Basin, Southwest China. [PDF]

ACS Omega, 2023
The Upper Permian Longtan Formation is the main source rock of the Lower Triassic Jialingjiang Formation in the Eastern Sichuan Basin, Southwest China. However, studies of its maturity evolution and oil generation and expulsion histories are lacking, which are not conducive to the accumulation dynamics of the Jialingjiang Formation in the Eastern ...
Zhang J, Zuo Y, Yang M, Huang W, Xu L, Zheng Z, Zeng J.   +6 more
europepmc   +3 more sources

Comparison of geological conditions and prospects of exploration potential of shale gas in upper permian Wujiaping formation and Longtan Formation, Sichuan Basin

Frontiers in Earth Science
Shale gas is a vital transitional energy source during the energy transformation period. With the ongoing development of the Longmaxi Formation shale gas field in the Sichuan Basin, identifying new alternative stratigraphic sequences has become a key ...
Manfei Chen, Manfei Chen, Manfei Chen, Jiajing Yang, Zhiyuan Lu, Ying Ming, Hua Wang, Siyu Chen, Wenjing Zhang   +8 more
doaj   +2 more sources

Fractal Characteristics of Pores in the Longtan Shales of Guizhou, Southwest China

Geofluids, 2020
The pore structure of marine-continental transitional shales from the Longtan Formation in Guizhou, China, was investigated using fractal dimensions calculated by the FHH (Frenkel-Halsey-Hill) model based on low-temperature N2 adsorption data.
Yuqi Huang, Peng Zhang, Jinchuan Zhang, Xuan Tang, Chengwei Liu, Junwei Yang   +5 more
doaj   +2 more sources

Reservoir characteristics of marine-continental shale gas in Upper Permian Longtan Formation, western Guizhou province

Shiyou shiyan dizhi, 2020
The reservoir characteristics of marine-continental shale gas in the Upper Permian Longtan Formation in the western Guizhou province were studied using X-ray diffraction, organic geochemistry, scanning electron microscopy, nitrogen adsorption, gas ...
Ende DENG, Zhihua YAN, Bingren JIANG, Ran WANG   +3 more
doaj   +2 more sources

Compressibility characteristics and modification effect of coal reservoirs in Longtan Formation, Nanchuan area, southeast Chongqing

Shiyou shiyan dizhi
Fracturing modification is an important method for enhancing the permeability and conductivity in coalbed methane (CBM) wells. To better guide the development and production of CBM wells in Longtan Formation of Nanchuan area, southeast Chongqing, the ...
Jinxian LIU, Tao GUO, Yatong ZHOU, Dongyang LI, Xiaobo JIN   +4 more
doaj   +2 more sources

Evaluation of Present Tectonic Stress Field and Permeability of Coalbed Methane Reservoirs by Inversion of Logging Data From Longtan Formation, Dahebian Block

Energy Science &Engineering, Volume 13, Issue 11, Page 5198-5217, November 2025.
ABSTRACT The permeability of coal reservoirs is predominantly controlled by the present tectonic stress field. This study systematically integrates macro‐ and micro‐scale analytical methods to investigate the controlling mechanisms of tectonic stress on pore‐fracture characteristics and permeability in the Longtan Formation coal reservoirs.
Guoqing He, Zhonghu Wu, Wenjibin Sun, Xianchao Yang, Jintao Zhou, Jun Yu, Baofeng Lan   +6 more
wiley   +2 more sources

Differences in gas sources of the Changxing–Feixianguan formations around the Kaijiang-Liangping Trough and favorable exploration directions for coal-formed gas generated by the Upper Permian Longtan Formation, Sichuan Basin, China

Journal of Natural Gas Geoscience
Through the analysis of natural gas composition, carbon and hydrogen isotopes of alkane gases, reservoir bitumen, source rock conditions, and source–reservoir combinations, this study clarifies the differences in gas sources and the origins of natural ...
Shipeng Huang, Zhenyu Zhao, Ai Yue, Hua Jiang, Xingwang Tian, Qingchun Jiang, Debo Ma, Wei Song, Haijing Song   +8 more
doaj   +2 more sources

Reservoir heterogeneity in deep marine-continental transitional shales: the role of lithofacies and quality in the coal-bearing longtan formation, central Sichuan basin [PDF]

Frontiers in Earth Science
Compared with marine shale formations, marine-terrestrial transitional shales exhibit rapid lithofacies changes. This poses significant challenges for the classification of shale lithofacies and the study of their characteristics.
Longyi Wang, Longyi Wang, Longyi Wang, Xizhe Li, Xizhe Li, Xizhe Li, Ya’na Chen, Ya’na Chen, Hongming Zhan, Xiangyang Pei, Yuchuan Chen, Nijun Qi, Nijun Qi, Nijun Qi, Weikang He, Weikang He, Weikang He, Wenxuan Yu, Yaoqiang Lin, Yuhang Zhou, Yuhang Zhou, Yuhang Zhou   +21 more
doaj   +2 more sources