So far, large-scale development of shale gas wells above 3500 m in the Changning Block Sichuan Basin has been realized by means hydraulic fracturing technology. As main process parameters are finally set, however, improvement rate its stimulation effect tends to slow down, while North America, single-well production increased significantly shortening cluster spacing and increasing proppant volumes. In order provide a reliable practice basis for optimizing process, this paper analyzes...

The timing of the Palaeo-Pacific Plate (PPP) subduction in East Asia, following amalgamation North and South China Blocks (NCB SCB), remains equivocal despite several investigations on widespread subduction-related Mesozoic magmatism this region. Here we report newly discovered granodiorites Sea Basin (ECSB) from deep boreholes (2945–2983 m), which yield SHRIMP zircon U–Pb age 174 ± 1.1 Ma. rock shows relatively high Sr/Y La/Yb ratios, low contents Ni, Cr, MgO, markedly negative values...

Abstract Fracture parameters are important for oil and gas production. In this paper, we establish a fully coupled flow effective stress model the single well multi‐stage hydraulic fracturing shale reservoir analyze optimal fracture of model. Firstly, consists single‐porosity medium zone, dual‐porosity zone. Then, on basis mechanism, theory porous elastic medium, evolution fractal dimensions, mechanism fluid transportation, an apparent permeability matrix system to couple deformation in...

In this study, flowback-assisted minifrac tests were conducted in low-permeability shale and salt formations to measure the situ stress. An injection/flowback testing protocol was implemented each test achieve accuracy efficiency. Accurate efficient is very important, given impermeable nature of these need complete as quickly possible. Each flowback cycle yields a distinct repeatable fracture closure signature, simplifying interpretation pressure. The objective paper share our field...

Natural gas exploration in the Middle Triassic Leikoupo Formation (T2l) Sichuan Basin of China has achieved a remarkable breakthrough recent years and thus attracts wide attention. However, there is no consensus on source. The genetic identification gas–source correlation based geochemical characteristics natural indicate that mainly from underlying Upper Permian Longtan/Wujiaping (P3l/P3w) source rocks (Moxi). Nevertheless, it assistance (Zhongba) or hydrocarbon supply condition (Chuanxi)...

Casing deformation is a key issue that restricts the efficient development of shale gas in Sichuan Basin, southwest China. In this study, we take Ning209 block as an example to analyze characteristics casing distribution and mitigation effect using reduced treating parameters on deformation. The geological structure in-situ stress indicate high horizontal difference pore pressure may be main cause Hence, based fault likelihood 3D model, geomechanical probability model slip established...

Shale softening is an important factor affecting fracturing effect. Through the Brinell hardness measurement of deep marine shale reservoir in South Sichuan Basin, mechanism after explored. laboratory test, key parameters are proposed as follows: indenter size 5 mm, loading force 613 N, 1226 and 2452 holding <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <mtext>time</mtext> <mo>&gt;</mo> <mn>10</mn> <mtext> </mtext> <mtext>s</mtext> </math> . It determined that content quartz clay...

Abstract. For eliminating pine trees infected wilt disease in southern China based on remote sensing technique, it is important to ensure the provision of timely information about individual diseased tree. It not easy detect and extract from conventional techniques. This paper proposes a new approach for extracting tree, without use satellite images aerial hyperspectral images. Field measurements different leaf stages indicates possibility by using only three regular bands, red, green blue....

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Abstract Casing deformation is an engineering problem that restricts the efficient development of shale gas in Sichuan Basin. This paper analyzed correlation between 67 casing points and 256 fracture zones N201 wellfield, conducted a statistical analysis distribution orientation zones, which may have/have not caused deformation. The Mohr–Coulomb criterion was used to analyze stress state slip risk these zones. results show indicate following. (1) Fracture zone main factor leading (2) with...

Abstract. A magnitude 7.0 earthquake struck Jiuzhaigou County, Sichuan Province at 21:00 on August 8, 2017, and the epicentre was located in major tourist spot of Jiuzhaigou. This paper describes surveying mapping project post-earthquake hazards regions for restoration reconstruction purposes. The triggered thousands collapses landslide disasters, causing severe damage to land scapes scenic roads such as Panda Sea. geological steep mountains slopes dense vegetation area are highly concealed....

Abstract Horizontal well multi-cluster fracturing technology is the most effective technical approach to exploit unconventional reservoirs (such as shale). The hydrocarbon productivity after often depends on selection of location and parameters. However, these influencing parameters are very diverse coupled with each other. Numerical simulation methods laboratory experiment complicated reflect nonlinear relationship. Therefore, this study develops a new multi-factor analysis method based...

We have predicted the flow permeability and its spatial distribution for Longmaxi shale gas reservoir using microseismicity induced during hydraulic-fracturing stimulation. In time-of-occurrence versus distance-from-injector plot, we find that microseismic points exhibit a parabolic envelope, which interpret as triggering front. This reveals fluid pressure diffusion is at least one of underlying mechanisms generation. derive large-scale equivalent diffusivity from front plot thereafter...

Abstract Casing deformation is a key issue that restricts the efficient development of shale gas in Sichuan Basin. In this study, H pad wells area used to determine correlations among casing and ant-tracking faults, microseismic events, treatment pressure. The results show might have been caused by fault slip induced hydraulic fracturing. Moreover, three-dimensional seismic well log data are establish fracture situ stress models based on discrete network finite element methods, respectively....

Microbial contamination is currently a major safety issue in low moisture foods. Current sterilization and pasteurization practices, such as conventional thermal processing involving conductive heat transfer to inactivate pathogens, appear inadequate address the problem low-moisture foods, which require long time heating, leading quality deterioration with significant loss of colour flavour. Radio Frequency (RF) heating has great potential foods offers possibility rapidly microorganisms...