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An alternative approach to match field production data from unconventional gas-bearing systems

Petroleum Science 2020年第5期17卷 1370-1388页

作者： Zhi-Gang Zhang Yan-Bao Liu Hai-Tao Sun Wei Xiong Kai Shen Quan-Bin Ba National Key Laboratory of gas Disaster Detecting Preventing and Emergency ControllingChongqing 400037China Chongqing Research Institute of China Coal Technology and Engineering Group Crop. Chongqing 400037China School of Resources and Safety Engineering Chongqing UniversityChongqing 400045China

Nowadays,the unconventional gas-bearing system plays an increasingly important role in energy *** performances of the current history-matching techniques are not satisfied when applied to such *** overcome this shortfall,an alternative approach was developed and applied to investigate production data from an unconventional gas-bearing *** this approach,the fluid flow curve obtained from the field is the superposition of a series of Gaussian *** automatic computing program was developed in the MATLAB,and both gas and water field data collected from a vertical well in the Linxing Block,Ordos Basin,were used to present the data processing *** the reservoir study,the automatic computing program was applied to match the production data from a single coal seam,multiple coal seams and multiple vertically stacked reservoirs with favourable fitting *** with previous approaches,the proposed approach yields better results for both gas and water production data and can calculate the contributions from different *** start time of the extraction for each gas-containing unit can also be *** new approach can be applied to the field data prediction and designation for the well locations and patterns at the reservoir scale.

关键词： Gaussian function Flow rate unconventional gas Ordos Basin gas-bearing reservoirs

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Development of unconventional gas and technologies adopted in China

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能源地球科学(英文) 2020年第1期1卷 55-68页

作者： Yang Li De-Hua Zhou Wei-Hong Wang Ting-Xue Jiang Zhao-Jie Xue China Petroleum&Chemical Corporation Beijing100728China Sinopec Exploration&Production Research Institute Beijing100083China Sinopec Research Institute of Petroleum Engineering Beijing100101China

This study analyses the geological characteristics and development progress of unconventional gas in China,summarizes the development theories and technologies,discusses the prospects and challenges of unconventional gas development,and puts forward the future trends of development *** technologies of unconventional gas development are available in *** gas development technologies include comprehensive geological evaluation,volume fracturing of cluster horizontal wells under complex stress conditions,and factory-like operation of horizontal wells in complex mountainous area et *** gas development technologies include fluid identification and quantitative prediction,optimization of well patterns,multi-layer fracturing in vertical well,staged fracturing in horizontal well,and drainage gas *** methane(CBM)development technologies include the prediction of medium-high-and medium-low-rank CBM enrichment areas,rate-variable hydraulic fracturing,and quantitative drainage recovery with five stages,three pressures,and four *** economic and effective development of unconventional gas,further efforts should be ***,intensified studies should be conducted on high-precision prediction and fine characterization technologies of high-quality shale reservoirs in deep marine,continental,and transitional ***,key theories and technologies such as fast drilling and completion of wells with long laterals as well as large-scale volume fracturing should be developed to improve well ***,new technologies such as multiple well-type development,fluid injection,and nano-flooding should be developed to enhance the ***,effort should be made to identify the accumulation mechanism and large-scale effective development technologies for ***,the application of large amounts of data and artificial intelligence in the entire process of unconventional gas development should be considered to reduce the dev

关键词： unconventional gas Geologic characteristics Development history Integrated development technology

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gas-in-place and its influence factors of the upper Paleozoic coal-bearing shale in the Qinshui Basin, China

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Frontiers of Earth Science 2023年第1期17卷 293-309页

作者： Chengang LU Ping GAO Gang LI Yue FENG Xiaorong QU Yufei SU Xianming XIAO School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Shanxi Coal Geology Surveys Research Institute Taiyuan 030031China

Coal-bearing shale shows great potential for unconventional gas resources in China, while its exploration and development have been challenging for a long time. gas-in-place (GIP) is critical to shale gas evaluation, but the major factors controlling the GIP content of coal-bearing shale remain unclear. To address this issue, the coal-bearing shales of the upper Carboniferous-lower Permian Taiyuan and Shanxi formations in the Zuoquan Block, Qinshui Basin, China, were collected for GIP measurements and an integrated investigation, including organic geochemistry, inorganic mineral compositions, and pore characterizations, was carried out. Our results show that the GIP content of the studied shales displays relatively low values and wide variations, which range from 0.30 to 2.28 m^(3)/t. The GIP is dominated by desorbed gas and residual gas. Total organic carbon (TOC) contents of the studied shales vary from 0.92% to 16.91%, and inorganic minerals are dominated by clays that mainly consist of illite/smectite mixed layer (I/S) and kaolinite. Inorganic pores have been widely observed in the studied shales, while the organic matter-hosted pores are rarely found using SEM observations. Total porosity of the studied shales is primarily contributed by clay minerals, followed by organic matter and quartz. Weak positive relationships between the GIP content and pore structure parameters imply that the adsorption of methane to nanopores is relatively weak, which may be attributed to the hydrophilicity of clay-hosted pores. Moreover, hydrophobic organic pores are not well developed. Positive correlations between the GIP contents and contents of TOC, clays, and the I/S indicate that major factors influencing the GIP contents of the coal-bearing shales are clays (especially I/S) and TOC content. In summary, these findings would be very helpful to reveal the enrichment mechanism of coal-bearing shale gas and provide a scientific basis for the exploration and development of coal-bea

关键词： coal-bearing shale clay minerals inorganic pore gas potential unconventional gas

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Evidence of the Near-Source Accumulation of the Tight Sandstone gas in Northern Ordos Basin,North-Central China

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Acta Geologica Sinica(English Edition) 2017年第5期91卷 1820-1835页

作者： YANG Zhi LI Qiyan WU Songtao LIN Senhu LIU Xinshen Research Institute of Petroleum Exploration & Development Petro China Research Institute of Exploration and Development Petro China Changqing Oilfield Company

The tight sandstone gas in Upper Paleozoic Formation of the northern Ordos Basin is a typical giant unconventional tight gas province. Evidences from geochemistry, reservoir geology and paleotectonic setting all verify that the present-day tight sandstone gas accumulation in the Ordos Basin is the result of near-source accumulation. The evidences are listed as following： tight sandstone gas is mainly distributed in the area with high gas-generating strength; gas composition was not subjected tofractionation; gas saturation significantly decreases with the distance away from the source rocks; gas isotopes suggest their origin is the same and maturity is consistent with in-place source rocks; reservoirs have experienced three types of densification digenesis, including intense compaction, siliceous cementation and calcareous cementation, which took place before the formation of a large amount of tight sandstone gas, forming tight reservoirs with low porosity and permeability, fine pore throat and great capillary resistance; the paleo-structural gradient ratio is small from the main hydrocarbon generation period to present. It is indicated the present distribution of tight sandstone gas in the northern Ordos Basin is the result of near-source and short-distance migration and accumulation.

关键词： near-source accumulation tight sandstone gas coal measures unconventional gas geochemistry

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