Fractures have significantly impacted the preservation, enrichment, and productivity of shale gas in Longmaxi Formation complex structural area southern Sichuan Basin. Based on outcrop, core, imaging logging, inclusion analysis, acoustic emission experiments, burial thermal evolution history data, formation stage, preservation conditions fractures were comprehensively studied. Shear are main fe...

Shale gas reservoirs are unconventional resources with great potential to help meet energy demands. Horizontal drilling and hydraulic fracturing have been extensively used for the exploitation of these resources. According engineering practice, some shale wells low flowback rate fluids may obtain high yield which is different from case conventional sandstone reservoirs, fluid absorbed into form...

The gas-rich Wufeng-Longmaxi shale has been intensely deformed within the fold-thrust belt of Yangtze Block. To better understand impact structural deformation on pore system, this paper systematically investigated matrix components, porosity and structures in core samples from theWufeng-Longmaxi shale, newly collected various domains first commercial gas field Central Block, Anchang Syncline. ...

Abstract The shale fracture characteristics are important for realizing the complex hydraulic network, predicting wellbore pressure, and optimizing trajectory rock fragmentation efficiency. Through a three-point bending test of notched semicircular specimens Longmaxi shale, coupled relationship mode-I toughness (Kic), peak force (Pmax), energy release rate (GI), applied work (W), loading was st...

Shale reservoir heterogeneity is strong, which seriously affects shale gas evaluation and reserves estimation. The Longmaxi Formation of the Luzhou block in southern Sichuan was taken as an example to characterize pore distribution over full scale using micro-computed tomography (CT), focusing on ion beam scanning electron microscopy (FIB-SEM) small-angle neutron scattering (SANS); further, exp...

The occurrence and flow of shale gas are substantially impacted by nanopore structures. fractal dimension provides a new way to explore the pore structures reservoirs. In this study, eight deep samples from Longmaxi Formation Wufeng in Southern Sichuan were selected perform series analysis tests, which consisted small-angle neutron scattering, low-pressure nitrogen adsorption, XRD diffraction, ...

Shale formations show obvious anisotropic characteristics in their mechanical properties due to pronounced bedding planes and natural fractures. This anisotropic behavior generally creates complex fracturing networks and is crucial to gas shale stimulation. Although much research has been done to study the anisotropic compression behaviors of shale with static and quasi-static strain rates, the...