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次生调整型油气藏是塔里木叠合盆地重要的油气聚集类型,多经历过复杂的充注与改造过程,而不同地质背景下的油气藏具有差异的演化历史。巴什托油气藏与塔北和塔中地区调整型油气藏具有不同的特征,恢复其成藏过程有利于揭示塔西南构造枢纽带次生调整型油气藏的聚集规律,寻找有利勘探区域。通过流体物理性质和地球化学性质分析,探讨巴什托油气藏中油气的次生变化和调整过程,结合流体包裹体测温和精细构造解释,恢复油气藏的成藏演化历史。1原油普遍高含C_(29)三芳甲藻甾烷,高含伽马蜡烷,甾烷含量C_(29)>C_(27)>C_(28),表明主要来源于寒武系烃源岩;2原油中含有25-降藿烷,指示早期原油经历过的降解,饱芳比、Ts/(Ts+Tm)和C_(23)TT/C_(30)Hop参数指示油气自西向东运移;3晚海西期和晚喜马拉雅期发生过2期油气充注,早期油气在中生代抬升剥蚀过程中遭受降解破坏,上新世晚期以来,圈闭发生构造翘倾,油气在圈闭内自西向东调整迁移,形成现今多层含油气的格局。根据巴什托油气藏调整过程分析,推测麦盖提斜坡西北部低幅度构造和色力布亚断裂高部位构造圈闭可能是次生调整型油气和晚期气侵的有利区域。
Secondary regulated reservoirs are important types of oil and gas accumulation in the Tarim superimposed basin, experienced complicated filling and reforming processes, and have different evolutionary history under different geological backgrounds. Baishituo reservoir has different characteristics with those in Tarim and Taizhong areas. Restoration of its accumulation process is beneficial to reveal the accumulation of secondary regulated reservoirs in the southwestern Tarim Basin and find beneficial exploration areas. Through the analysis of fluid physical and geochemical properties, the secondary changes and adjustment processes of oil and gas in the Basset oil and gas reservoir are discussed. Based on the temperature measurement and fine structure interpretation of fluid inclusions, the reservoir evolution history of oil and gas reservoirs is restored. 1 C_ (29) triarylthiostanes, high gamma-gamma-alkanes, and steranes C_ (29)> C_ (27)> C_ (28) are all generally found in crude oil, indicating that the crude oil mainly comes from the Cambrian source rocks ; 2 crude oil contains 25-norhopane, indicating that the degradation, saturation ratio, Ts / (Ts + Tm) and C23T / C30 Hop parameters of early crude oil indicated the migration of oil and gas from west to east ; 3 oil-gas charge occurred in the late Hercynian and late Himalayan periods, and the early oil and gas suffered the degradation and destruction during the Mesozoic uplift and denudation process. Since the Late Pliocene, the traps have tectonic tilting and the oil and gas traps westward Eastern adjustment and migration, the formation of today’s multi-layer oil and gas containing the pattern. Based on the analysis of Baishituo reservoir adjustment process, it is speculated that the low-amplitude tectonic traps in the northwestern part of the Maigaiti slope and the structural traps in the high part of the Seri Buya fault may be favorable areas for secondary regulated oil and gas migration and late gas invasion.