Oligocene resources potentials and exploration directions in the Yingbei area,Yinggehai basin
The Yingbei area in Yinggehai basin exhibits restricted resource potential in its Miocene source rocks,posing limitations on hydrocarbon exploration.Utilizing geological,geophysical,and geochemical data,this study conducted the identification of the Oligocene delta in the Yingbei area,analysis of its coal bearing property,evaluation of the resource potential,and comparison of the hydrocarbon accumulation conditions across distinct structural configurations.The results clarify the resource potential of the Oligocene strata and identify promising exploration directions in the Yingbei area.The study reveals that:①the Oligocene epoch in the Yingbei area was characterized by suitable depositional and tectonic settings for the development of extensive(fan)deltas.An inherited development of large coal-bearing deltas was observed within the Yacheng Formation and Lingshui Formation,yielding two source rock types:the coal sequences within the deltaic plain of the Yacheng Formation and the terrigenous marine mudstones of the Lingshui Formation;②the coal-bearing deltaic deposits of the Oligocene strata are the primary hydrocarbon source rocks within the Yingbei area.These deposits have reached a high to over-maturity stage of thermal evolution,conducive to substantial gas generation,with estimated natural gas resources reaching 1.13 trillion cubic meters;③the mid-reservior-seal assamblages in the depression zone and the eastern slope belt of the Yingbei area exhibit the most favorable exploration potentials.Large lithostratigraphic traps positioned over structural ridges and noses,with favorable migration and accumulation conditions,represent critical areas for targeting substantial gas discoveries.The research results serve as a significant guidance for the exploration breakthrough in the Yingbei area.
Yinggehai basinYingbei areaOligocenecoal-bearing deltaresource potentialexploration direction
万方数据
维普
