准噶尔盆地南缘天然气成因与成藏解剖

利用全烃地球化学方法,结合准噶尔盆地南缘三排构造特点,在确认油气源和天然气成因的基础上,对呼图壁气田、吐谷鲁和齐古油气田进行了成藏历史分析和解剖.研究表明各构造带不仅捕获了喜山期侏罗系高熟煤成气,这是该区天然气成藏的关键,而且还聚集有燕山期侏罗系低成熟-成熟阶段的油气,但不同构造带对这一阶段的油气的聚集量、方式和保存作用不同,第一排构造直接捕获大量侏罗系低成熟-成熟油气,但天然气的散失严重;第二、三排构造存在白垩系-下第三系中转侏罗系低成熟-成熟油气的特征.最后阐述了准噶尔盆地南缘进一步寻找天然气的勘探方向.

Natural Gas Genesis and Formation of Gas Pools in the South Margin of Junggar Basin

By using the whole hydrocarbon geochemistry method, combined with the three row structures characteristics in the south margin of Junggar basin, based on the oil-gas sources and the natural gas genesis, the formation history of oil-gas pools in Hutubi, Tugulu and Qigu has been analysed deeply. It is ascertained that the each row structure not only succeeded in catching the Xishan period high mature coal-measure gas in Jurassic, which is the key to form gas pools, but also gathering the Yanshan period low and mature stage oil-gas from Jurassic, but the gathering measures, catching ways and preserving conditions are different for this stage of oil-gas in different structures, the first row structure succeeds in catching the large quantity low and mature oil-gas from Jurassic, but natural gas loss is serious; The second and third row structure exist the middle-turn low and mature Jurassic oil-gas from Cretaceous-Jurassic floors. The article finally points out the exploration direction of gas pools in the south margin of Junggar basin.