Abstract The southern margin of the Sichuan Basin is characterized by strong structural deformation, complex fault structure styles and scales, multistaged geological evolution stages, which together have created various shale gas preservation conditions. Taking Jianwu (JW)–Luochang (LC)–Shuanglong (SL) synclines as an example, development characteristics Longmaxi Formation were studied based on fine seismic interpretation microscopic tests (rock acoustic emission experiments...

Abstract The Da’anzhai Member limestone in the central Sichuan Basin holds significant importance as a tight oil-producing formation. Despite its crucial role, intricate patterns of hydrocarbon enrichment and elusive geological factors dictating high-yield production have impeded oil exploration development Basin. This study delves into characteristics identifies key influencing production, utilizing comprehensive data derived from cores, thin sections, well logging, seismic studies, tests...

Natural fractures (particularly those reshaped by multiple tectonic stages) are of paramount importance for the development tight conglomerate hydrocarbon reservoirs. These not only enhance reservoir pore space but also serve as essential conduits migration. Focusing on Permian Jiamuhe Formation reservoirs in Xiaoguai area Junggar Basin, this study integrates structural interpretation, core observation, and well-log evaluation to elucidate characteristics vertical distribution fractures. A...

Tectonic fractures are the key factors affecting hydrocarbon migration and accumulation in ultradeep marine carbonate gas reservoirs. Taking Maokou Formation Jiulongshan Gas Field as an example, tectonic fracture formation distribution quantitatively characterized by outcrops, cores, Fullbore MicroImager (FMI) imaging logging, acoustic emission experiments, fluid inclusion burial–thermal evolution history analysis. The stage of study area can generally be divided into three stages:...

Taking the Lower Silurian Longmaxi Formation in Changning area of southern Sichuan Basin as an example, characteristics and formation stages tectonic fractures are comprehensively studied by regional scale geological analysis microscopic experimental tests. Regional shows that there mainly high-angle vertical structural fractures, which have small opening, large spacing, fracture density, high filling degree. The systems can be divided into three six groups, correspond to compression near...

The main geological factors controlling the accumulation and yield of marine‐facies shale gas reservoirs are focus current exploration development research. In this study, Wufeng‐Longmaxi Formation in Dingshan area southeast Sichuan was investigated. Shale cores underwent laboratory testing, which included evaluation total organic carbon (TOC), vitrinite reflectance (Ro), whole‐rock X‐ray diffraction (XRD), pore permeability, imaging through field emission scanning electron microscopy...

Abstract In view of the complex reservoir heterogeneities within weathered volcanic rocks, taking Carboniferous profile northwest Junggar Basin as an example, this study aims to characterize rocks by core, thin slice, log interpretation, and experimental test. The are mainly composed lava, breccia, tuff, etc, which formed in a arc environment. As result weathering denudation, can be divided into four layers: clay layer, intensive zone, weak unweathered compacted zone. preserved void space...

Fracture prediction is a technical issue in the field of petroleum exploration and production worldwide. Although there are many approaches to predict distribution cracks underground, these have some limitations. To resolve issues, we ascertained relation between numerical simulations tectonic stress predicted fractures from perspective geologic genesis, based on characteristics shale reservoir Longmaxi Formation Dingshan; features fracture development this were considered. 3D finite element...

In mining process, the height of water flowing fractured zone is important significance to prevent mine and gas, in order further research failure characteristic overlying strata.Taking certain coal with 5.82 m as experimental face, by using equipment which sealed two ends capsules borehole, affused measurable between borehole televiewer system, ground penetrating radar, microseismic monitoring system underground mine, fully-mechanized top caving are monitored, a numerical simulation...

This study attempts to design a novel direction-oriented approach for estimating shear wave velocity (VS) through geostatistical methods (GM) using density employing geophysical log data. The research area involves three hydrocarbon wells drilled in carbonate reservoirs that are comprised of oil and water. Firstly, VS was estimated the four selected empirical rock physics relationships (ERR) well A (target well), then all results were evaluated by ten statistical benchmarks. All show best...

Fractures in Carboniferous volcanic rocks located at Zhongguai Area (China) highly influence the accumulation and productivity of oil gas. As such, study development periods genetic mechanisms tectonic fractures could throw useful information regarding evaluation that reservoir. Their origins caused high-angle oblique shear fractures. The primary orientation those appears close to EW (270°±10°), NW (300°±15°), NE (45°±15°), SN (0°±10°). At least four fracture generations can be found Area....

The marine organic-rich shale of the Longmaxi Formation in Dingshan area, southeast Sichuan, was studied using scanning electron microscopy (SEM), nitrogen adsorption/desorption and methane isothermal adsorption, mainly emphasizing nanometer pore structure organic matter (OM) its effect on adsorption. results show that with high total carbon (TOC) content mature stage develops a large number inkbottle-shaped pores sizes 3-50 nm, which provide more effective adsorption sites storage space for...

The reservoir structural fractures have excellent fractal characteristics, as well self-similarities. Based on the theory, surface characteristics of faults and characteristic in core Xujiahe Formation Fault-Fold Belt central Yuanba area were studied, a quantitative relationship was set up between them. faults, predictions made favorable fracture zone, which provides new idea for research fracture, offers theoretical references exploring development zone during oil-gas exploration. results...

The composition and carbon isotope distribution of shale gas from the Longmaxi Formation in Dingshan area were measured, their responses to thermal maturity (Ro) analyzed. results show that is mainly composed methane (97.98–98.99%), ethane, propane nonhydrocarbon gases (N2 CO2) an organic high temperature oil-type cracked gas. wetness value [(C2+C3)/(C1+C2+C3) × 100%] ranges 0.39% 0.74%. early (Ro > 1.3%) residual kerogen crude oil cracking was mixed with late 2.0%) secondary gas, resulting...

Tectonic fractures are a significant factor for production of the Longmaxi formation in Dingshan area. The analyse distribution and development degree tectonic is main research method present-day. Based on data field outcrops borehole core, new method-binary put forward by rock fracture energy value to decide development. According fitting formula offered between relation fracture, density. Compared density predictive observed 15 wells, all wells relative error less than 25%. prediction...