论文部分内容阅读
滇中楚雄盆地是在扬子板块西南被动大陆边缘发育起来的一个中新生代含油气盆地.盆地形成于晚三叠世(印支晚期),经历了自印支期以来的多期次构造运动,具有复杂的构造形态.通过地质与地球物理资料的综合解析表明,哀牢山碰撞造山带形成后,盆地继续向造山带下发生陆内“A”型俯冲,在盆地内形成了大规模的推覆滑脱构造,将古生界及部分中生界地层深埋其下;燕山期,盆地东部的隆升,形成向盆地内部的挤压推覆;喜山期印度板块与欧亚板块的碰撞,盆地基底断裂产生走滑活动,形成盖层内的花状构造.楚雄盆地内发育有古生界至中新生界海相到陆相多套生油层系,经过推覆后深埋于盆地内,得到了较好保存.据盆地埋藏与热演化史研究表明,古生界及三叠系主要生油层系已进入高热演化的干气阶段,揭示了楚雄盆地今后的勘探方向应以寻找天然气为主.
The Chuxiong Basin in central Yunnan is a Meso-Cenozoic petroliferous basin developed on the passive continental margin of southwest Yangtze Plate. The basin was formed in the late Triassic (the late Indosinian) and underwent multi-stage tectonic movements since the Indosinian period with complex tectonic forms. Through the comprehensive analysis of geological and geophysical data, it shows that after the formation of the Aoraoshan collision orogenic belt, the inland “A” type subduction continued to occur under the orogenic belt in the basin, forming a large-scale thrust-slip structure in the basin, The Mesozoic and some Mesozoic strata buried deeply. During the Yanshanian period, the eastern uplift of the basin resulted in the extrusion nappe to the interior of the basin. The collision between the Himalayan plate and the Eurasian plate resulted in the strike-slip of basal faults Activity, the formation of the cap layer flower-shaped structure. The Paleozoic to Mesozoic Mesozoic and Mesozoic to Jurassic oil-bearing strata developed in the Chuxiong Basin, and were well buried in the basin after the thrusting and were well preserved. According to the basin burial and thermal evolution history studies, the Paleozoic and Triassic major oil-bearing formations have entered the dry gas stage of high thermal evolution, revealing that the future exploration direction of the Chuxiong Basin should mainly look for natural gas.