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为深化对库车坳陷致密砂岩气藏成因类型的认识,采集致密砂岩储层岩样,开展了油气充注史和孔隙度演化史研究.通过流体包裹体岩相学和显微测温厘定了油气充注史,利用沉积-构造-成岩一体化模型恢复了储层孔隙度演化史,根据两者的先后关系,划分了致密砂岩气藏的成因类型.结果表明,依南2侏罗系气藏存在两期油气充注,第一期是吉迪克期到康村期(23～12Ma)的油充注,第二期是库车期到现今(5～0Ma)的天然气充注,储层孔隙度在库车期前(12～8Ma)降低到12%以下,形成致密砂岩储层.迪那2古近系天然气藏存在两期油气充注,第一期是康村期到库车期(12～5Ma)的油充注,第二期是库车期到现今(5～0Ma)的天然气充注,储层孔隙度在西域期(2～0Ma)降低到12%以下,形成致密砂岩储层.综合分析认为,库车坳陷存在两种成因类型的致密砂岩气藏,依南2侏罗系气藏致密储层形成之后充注天然气,成因类型为“致密深盆气藏”;迪那2气藏古近系致密储层形成之前,天然气已大量充注,成因类型为“致密常规气藏”.这对深化库车坳陷致密砂岩气勘探与开发有重要意义.
In order to deepen the cognition of the genetic type of tight sandstone gas reservoirs in the Kuche Depression and to collect the samples of tight sandstone reservoirs and to study the history of oil and gas filling and the evolution history of porosity.According to the petrography and microtherm determination of fluid inclusions According to the history of oil and gas filling, the evolution history of reservoir porosity was restored by using sedimentary-tectono-diagenetic integration model, and the genetic types of tight sandstone gas reservoirs were divided according to the relationship between them.The results show that the Yinsan 2 Jurassic There are two phases of hydrocarbon accumulation in the gas reservoir. The first phase is the oil filling from the Jidike period to the Kangcun period (23 ~ 12Ma), and the second is the natural gas filling from the Kuche period to the present (5-10 Ma) The porosity of the layer decreased to less than 12% before the Quercus period (12 ~ 8Ma), forming a tight sandstone reservoir. There are two stages of oil and gas filling in the Darnay-2 Paleogene natural gas reservoir. The first period is from Kangcun period to Kuche Period (12 ~ 5Ma) oil filling, the second period is from the Kuche period until now (5 ~ 0Ma) natural gas filling, reservoir porosity in the western region (2 ~ 0Ma) decreased to 12% below the formation of dense Sandstone reservoirs.A comprehensive analysis shows that there are two types of tight sandstone gas reservoirs in the Kuqa Depression and that after the formation of tight reservoirs in the Jurassic gas reservoirs in the South 2, Natural gas, genetic type is “tight deep basin gas reservoir ”; Dina 2 gas reservoir before the formation of tight reservoirs, natural gas has been a large number of filling, genetic type "tight conventional gas reservoir The exploration and development of tight sandstone gas in the Kuqa Depression is of great significance.