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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2009-06
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Basic characteristics of shale and continuous-discontinuous transition gas reservoirs in Sichuan Basin,China

LIU Shu-gen,ZENG Xiang-liang,HUANG Wen-ming,MA Wen-xin State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China  
Sichuan Basin is a polycyclic superimposed basin.There are two sets of high qualitative marine source rocks(Lower Cambrian Niutitang Formation shale and Lower Silurian Longmaxi Formation shale) with high maturity(Ro=1.5%~6%).Most areas of the basin are not favorable to Niutitang Formation shale and Longmaxi Formation shale gas accumulation.There exist two sets of transitional(marine-nonmarine) type high quality source rocks(Upper Permian Longtan Formation;Upper Triassic Xujiahe Formation) as well,with relatively low maturity(Ro =0.7%~3%).There will be a more favorable prospect area for the Longtan Formation and Xujiahe Formation shale gas exploration in the southwest and south of Sichuan Basin.The hydrocarbon expulsion efficiency of the shale source rocks in Sichuan Basin is high and the large scale of conventional gas fields has been formed.Shale gas reservoirs had superior geological conditions in the early stage and went through the biogenic gas efficient accumulation,rapid oil-cracking gas accumulation in the middle deep buried stage,accumulation and adjustment of de-dissolved and desorption gas in the late rapid uplifting stage,and so on.There are various oil gas reservoirs in Sichuan Basin including continuous,discontinuous and transitional gas pools.Typical discontinuous gas reservoirs are structural trap and structural-lithologic trap gas reservoirs with relatively independent traps and discontinuous distribution and pore-type reservoir rocks.The examples include the Weiyuan Sinian System gas field in South Sichuan,Carboniferious System gas field groups in East Sichuan,Lower Triassic Feixianguan Formation gas field groups in Northeast Sichuan,and so on.The transitional reservoirs have dominant composite traps with fractured traps(Lower Permian Yangxin series gas reservoirs in Southeast Sichuan) and lithologic traps(Upper Triassic Xujiahe Formation gas reservoirs).Main reservoir pore spaces of the transition gas pools are fractures or secondary pores with strong heterogeneity and general overpressure.The distribution of transition gas reservoirs was scattered or continued.Shale gas reservoirs are typical continuous reservoirs,but there has not a successful exploration and development case in Sichuan Basin so far.Sichuan Basin has gone through multiple tectonic-sedimentary evolutions,resulting in regional distribution of high quality hydrocarbon sources,reservoir heterogeneity and gas activity.The hydrocarbon reservoirs have experienced successive and diverse processes,such as biogenic gas,adsorbed gas,oil-cracking gas,desolution gas and desorption gas.Therefore,the oil gas exploration and research in Sichuan Basin should form dimensional exploration and research strategy,including conventional and unconventional,continuous and discontinuous,primary and secondary reservoirs,especially strengthening the study of characteristics on the formation mechanism and distribution of transitional(continuous-discontinuous) gas reservoirs.
【Fund】: 国家重点基础研究发展计划“973”项目(2005CB422106);; 中国石化海相前瞻性项目(PH08001)
【CateGory Index】: P618.13
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