地质科学2011，Vol.46Issue(4)：1119-1131,13.
被动裂陷盆地油气分布规律及主控因素分析——以塔木察格盆地塔南坳陷为例
The law of oil and gas distribution and mainly controlling factors of the passive rift basin:The Tanan depression of Tamuchage Basin
摘要
Abstract
Tanan depression is a typical passive rift basin, and has four tectonic evolution stages: passive rift stage, active rift stage, fault-depression conversion stage and depression stage, as well as two petroleum systems;the passive rift petroleum system which oil and gas mainly occur and active rift petroleum system. The major controlling factors of oil and gas distribution have three aspects. First of all, the regional cover and long-term development of fault control the layer of oil and gas accumulation. The Basin has two mudstone regional covers: Nan-1 section and Da-1 section, which has high thickness and mud ratio, controlling the oil and gas accumulation of two petroleum systems. The long-term development of fault forms shale smear of shearing type at the cover. When the SSF is greater than 5, shale smear losts the continuity and oil and gas which through the regional cover occur vertical migration, accumulating at Da-2 section, as well as forming secondary reservoir. Second, the effective hydrocarbon kitchen and good reservoircontrol the scale of oil and gas distribution, while active and passive rift stage both develop a set of hydrocarbon source rock. The passive rift stage of hydrocarbon source rock has interbedded sand and mud structure, so the expulsion efficiency of hydrocarbon is high, which is high-quality source rock. The role of atmospheric water washout filter and organic acid dissolution is that forms a high-quality reservoir,respectively,at the footwall of antithetic fault and trough,so oil and gas occur a short distance lateral migration. Oil and gas distribution has typical characteristics,such as "source control" and "high-quality reservoir control". The third is the antithetic fault,the lower uplift and the fan complex control the gas accumulation. There are many antithetic faults resulting from the tectonic subsidence and the tilting at the stage of passive rifting, and they have the advantages as " three phases the synchronous product-resevoir" ," three aspects compose the play" and "three types compoundly control the gas" are favour of forming the reservoir,so they are the typical reservoir model for the passive rift basin. The passive rift stage resut in the bottom wall of the antithetic fault low upward, the initiative rift stage result in the central anticlinal zone, and the reversion stage of the basin result in the reverse structure zone, and they provide place for two different hydrocarbon and secondary gas system to accumulate gas respectively. The onshore subsea apron accumulate gas in the central of depression, and formed the lithologic hydrocarbon reservoirs.关键词
塔南坳陷/被动裂陷盆地/断—盖共控/源控/优质储层/反向断层Key words
Tanan depression,The passive rift basin,The controlling effect of rift-cover,Source control,High-quality reservoir,Antithetic fault分类
能源科技引用本文复制引用
付晓飞,王勇,渠永红,沙威..被动裂陷盆地油气分布规律及主控因素分析——以塔木察格盆地塔南坳陷为例[J].地质科学,2011,46(4):1119-1131,13.基金项目
黑龙江省普通高等学校新世纪优秀人才培养计划项目(编号:1251-NCET-015)资助. （编号:1251-NCET-015）
