CAJ | 학술논문

通过鄂尔多斯盆地上古生界气源条件的综合分析，确定优质烃源岩是控制致密砂岩大气田形成分布的主要因素，并结合试气结果分析致密砂岩大气田形成的生气强度下限。首先对鄂尔多斯盆地上古生界烃源岩的厚度、有机碳含量和热演化程度等参数进行对比；接着在类比分析的基础上计算求取生气强度，并将其与试气成果结合进行综合分析。气源条件分析结果显示，鄂尔多斯盆地上古生界烃源岩品质好、分布广、热演化程度高，其生气强度介于10×108～40×108 m3/km2，具有高强度、大范围的供气特点；盆地西部生气强度介于10×108～20×108 m3/km2，而盆地东部生气强度相对较高，多大于16×108 m3/km2。综合分析认为：优质烃源岩是形成致密砂岩大气田的主要因素之一，从宏观上控制了鄂尔多斯盆地上古生界致密砂岩储层内气、水的空间分布状态；由于为近距离成藏，其天然气聚集效率高，因此上古生界准连续型致密砂岩气藏的生气强度下限可降低至10×108 m3/km2左右。
통과악이다사분지상고생계기원조건적종합분석，학정우질경원암시공제치밀사암대기전형성분포적주요인소，병결합시기결과분석치밀사암대기전형성적생기강도하한。수선대악이다사분지상고생계경원암적후도、유궤탄함량화열연화정도등삼수진행대비；접착재류비분석적기출상계산구취생기강도，병장기여시기성과결합진행종합분석。기원조건분석결과현시，악이다사분지상고생계경원암품질호、분포엄、열연화정도고，기생기강도개우10×108～40×108 m3/km2，구유고강도、대범위적공기특점；분지서부생기강도개우10×108～20×108 m3/km2，이분지동부생기강도상대교고，다대우16×108 m3/km2。종합분석인위：우질경원암시형성치밀사암대기전적주요인소지일，종굉관상공제료악이다사분지상고생계치밀사암저층내기、수적공간분포상태；유우위근거리성장，기천연기취집효솔고，인차상고생계준련속형치밀사암기장적생기강도하한가강저지10×108 m3/km2좌우。
A comprehensive analysis of the Upper Paleozoic gas source conditions in Ordos Basin shows that high quality source rock is the major factor controlling the formation and distribution of large tight sandstone gas field in the study area . The lower limit of gas generation intensity for large tight sandstone gas field is determined based on analysis of gas pro -duction test results .A correlation analysis is first performed on the thickness , total organic carbon content ( TOC ) and maturity of the Upper Paleozoic source rocks in Ordos Basin ,and gas generation intensity of the sources rocks is then cal-culated based on the correlation analysis .The calculation results are finally integrated with gas production tests to perform comprehensive analysis .The analysis of gas source conditions indicates that the Upper Paleozoic source rocks are charac -terized by high quality,wide distribution,high maturity,high intensity of gas generation and wide gas supply .In general, the intensity of gas generation ranges from 10 ×108 m3/km2 to 40 ×108 m3/km2 .However,the gas generation intensity is not equilibrium in the whole basin .It ranges from 10 ×108 m3/km2 to 20 ×108 m3/km2 in the western basin ,whereas,it is more than 16 ×108 m3/km2 in most part of eastern basin .In conclusion ,high quality source rock is one of the major fac-tors controlling the formation of large tight sandstone gas field ,and it also controls the distribution of gas-water contact in the Upper Paleozoic tight sand reservoirs .As gas accumulation is closed to the source rocks and the accumulation efficien-cy is high,the lower limit of gas-generation intensity can be reduced to about 10 ×108 m3/km2 for Upper Paleozoic quasi-continuous tight gas accumulation in Ordos Basin .