Assessment On Hydrocarbon-bearing Condition In Strata Of Carboniferous～Lower Triassic, Jianghan Plain

The geologic condition of Carboniferous ~ lower Triassic in Jianghan Plain is of great advantage for hydrocarbon bearing, and these stratum are the important areas for marine hydrocarbon exploration, in spite of more than twenty years' exploration, no commercial discoveries have been achieved yet.In this paper, thermal evolution history of organic matter of the source rocks and hydrocarbon generation history have been researched by TTI method, hydrocarbon migration direction and migration times were probed combining with the area structure development feature; Distribution pattern of the main reservoir intervals on lateral and longitudinal have been predicted by researching on development feature and control factors of the reservoir intervals, the actions of reservoir conditions in hydrocarbon accumulation and bearing also were probed combining with pore evolution feature; the micro-pore feature of regional cap and direct seal in Carboniferous -lower Triassic in this area have been determined with micro-capillary pressure curve and intrusive mercury curve; the prospecting districts have been pointed out combining with the hydro-geologic feature, the potential reservoirs were classified according to trap types in this area, the author attempt to evaluate on the hydrocarbon-bearing condition in the strata of Carboniferous ~ lower Triassic from hydrocarbon generation and migration reservoir condition, reserved condition etc, and predict the reservoir types and hydrocarbon-bearing patterns combining with the structure evolution. Based on above, the author point out that the central block of Chenghu-tuditang synclinorium and the southern block of Dangyang synclinorium are the advantageous regions for exploration.