白音查干凹陷稀油成藏研究及勘探方向

白音查干凹陷自下而上发育了阿尔善组、腾格尔组及都红木组(包括都一段、都二段、都三段)三套烃源岩,前两套为高成熟一成熟生油岩,都红木组则处于低熟-未熟阶段.油源对比及有机地化分析等研究结果表明,除稠油外,凹陷内有三种成因不同的稀油,其成藏期可分为四个期次,成藏模式因期而异.研究表明,生油洼陷、生储盖组合、沉积相带和构造背景是稀油成藏的主要控制因素,下一步勘探应围绕近洼的前排构造展开.

RESEARCH ON THIN OIL ACCUMULATION AND FUTURE EXPLORATION DIRECTION IN BAIYINCHAGAN DEPRESSION

There are three sets of source rock in Baiyinchagan Depression,from below to the above are: Aershan Formation, Tenggeer Formation and fhthongmu Formation(include Du section one, Du section two and Du section three).The first two sets of Aershan and Tenggeer Formations are over-mature to mature source rock, but Duhongmu Formation is still in low-mature to immature stage. The research on oil source contrast and the analysis of organic geochemistry indicate that there are three. sorts of different origins thin oil besides heavy oil in the depression, thin oil accumulation stages can be divided into four periods, and the models of accumulation vary along with different periods. Exploration practice shows that main control factors of thin oil accumulation are source sag, combination of source-reservoir-cap, sedimentary fades zones and the structure background. Future exploration of the Depression should be evolved from the front structure of adjacent source sag.