Enrichment patterns of Yan8-10 oil reservoirs in Yan'an Formation of Haotan area,Ordos Basin
The lower section of Yan'an Formation in Haotan area of Ordos Basin has superior oil and gas display,and it is the main oil layer for stabilizing and increasing production of conventional oil and gas reservoirs in Changqing Oilfield.However,the reservoir char-acteristics of Yan'an Formation in the study area are poorly characterized,and the reservoir enrichment law is unknown,which seriously restricts the exploration and development of the reservoir and the advancement of the work of increasing and stabilizing the production of the oilfield.On the basis of previous research,this paper analyzed the accumulation control factors of Yan'an Formation in Haotan area by combining with the reservoir characterization study,and explored the enrichment law of the lower section of Yan'an Formation in the study area and dissected its accumulation mode by combining with the fine dissection of the existing reservoirs.The results show that the Yan'an 8-10 reservoir sandstones in Haotan area have high physical properties,and the whole is a medium pore with medium-low-per-meability reservoir,with the main oil storage spaces being intergranular pores and feldspathic pores.Sedimentation-diagenesis-tectonic coupling effect controls the oil enrichment and accumulation in the lower part of Yan'an Formation in Haotan area.Sedimentation-dia-genesis-tectonic coupling controls the development and distribution of high-quality reservoirs in the lower part of Yan'an Formation,and the local development of small-amplitude tectonic uplift formation of the trap is favorable for oil enrichment and preservation.The oil reservoirs of the Yan'an Formation in Hao Tan area are mainly paleomorphic oil reservoirs and lithologic-tectonic oil reservoirs,which are mainly composed of three accumulation modes,including slope ancient landform formation mode,inter-river mound structure-litholo-gy accumulationmode and slope nozzle lithology-structural accumulation model.
万方数据
维普
