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New Progress in the Studies on Basic Geological Theories of Natural Gas in China
详细信息   
摘要
After more than 30years’technical research of natural gas,Chinese scholars have developed their own geological theories on natural gas accumulation and gas pooling.However,along with the increasing difficulty of natural gas exploration and obvious contradiction between supply and demand,such geological theories need to be continuously developed and completed as guidance to tap and discover more natural gas resources.In view of this,the related basic geological theories on the formation of large gas fields were studied during the national Eleventh Five-Year Plan and the achieved results are presented herein.(1) The lower limit values of the generation of three types of natural gas including coal-derived gas,oil-cracking gas,and biogas are lowered down.(2) The erosion rate of sandstones is increased twice to three times under high temperatures over 150℃and high pressures more than 40MPa.(3) The quantitative method of evaluating the quality of cap rocks by multiple factors is developed so that the assessment of cap rocks is gradually becoming quantitative.(4) The forming conditions and main controlling factors of five types of gas reservoirs,including large-area and low-permeability sandstone,bank / reef and karstification,volcanic,super-high pressure,and biogas,are studied and the gas pooling modes and distribution laws are set up and clarified.Furthermore,more understandings are obtained about the theories of natural gas exploration in the above-mentioned three major target zones.(1) The theory of highly efficient gas accumulation near source rocks is developed for the exploration of low-permeability sandstone gas reservoirs,which helps to significantly increase the reserves of gas reservoirs in the Sulige Gas Field and the Xujiahe gas reservoirs in the Middle Sichuan Basin.(2) The theory of regarding the hydrocarbon generation at fault troughs as the basic unit is advanced for the exploration of volcanic gas reservoirs,which helps to achieve great breakthrough in the gas exploration of middle and small faulted volcanic reservoirs in the deep Songliao Basin.(3) The theory is deepened about the exploration of platform edge and reef carbonate gas reservoirs,which guides the whole exploration assessment of the Longgang Gas Field and further extension of gas exploration to its west and east and the risk-taking gas exploration in the Sichuan Basin.

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