摘要
这是晚第三纪形成的一个微型地堑型断陷盆地,面积83km。它的石油地质特征是:(1)沉积物厚 2400余米,油气源岩较厚;(2)有机质丰富,并已处于低成熟阶段;(3)生储盖配置关系良好,并存在若干有效的储油砂体。因此,在该盆地内发现小型油气田是有可能的。
Abstract
A series of micro-type fault-depressed basins of the Late Cenozoic are distributed in west Yunnan Province. Each of them is less than 250 km.Among them,there are four basins with an area of more than 80km, sediment thickness greater than 1,000m. Now oil and gas have been discovered in theJinggu Basin. The Jinggu Basin, with an area of 83 km, is a dustpan-like fault-depressed basin formed upon the folded basement of Early Tertiary. It containscoal-series strata of continental sand-mudstone with a thickness of more than 2,400m, and is characterized by: (1) great thickness of sediments and sourcerock; (2) source rock is rich in organic matter (organic carbon is 1.145%,chloroform bitumen A is 0.12%, total hydrocarbon is 1307 ppm), and hasreached lower matured stage (vitrinite reflectance R is 0.61-0.69%); (3)dis-posal relationship of generating, reservoiring and covering combination is good.
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