Research On Structure Elucidation And Hydrocarbon Reservoir Evaluation Of Wen' An Slope

The development of the oilfield has entered high water cut stage and extreme high water cut stage. For further improving recovery ratio and development of residual oil were more and more difficult, hence, fine reservoir evaluation became necessary. In order to further evaluation and development, fine reservoir description, stratigraphic classification and correlation were the basic theories to analyze structures characteristics.Based on the analysis of exploration poetical, Wen'an slope was characterized by abundant residual oil/gas, large prospecting area and located in the favorable route of oil/gas migration, which were the prospects of lithologic and stratigraphic hydrocarbon reservoir.According to the analysis of hydrocarbon accumulation conditions of north Wen'an slope and distribution rules of proven hydrocarbon reservoir, this paper had summarized hydrocarbon accumulation rules in Wen'an slope, which marked exploration prospects in this area.This paper had divided time stratigraphic unit which can reflect deleveling in stratigraphic record according to high resolution sequence stratigraphy, which can improve the accuracy of prediction. Based on the synthetic analysis of geology, this paper had built up the tectonic evolution history of Guantao Formation by using technology of balanced cross section. Combined with density logging, synthetic seismogram had been made to calibrate target horizons to seismic events, which had changed geological horizon horizontal tracing into seismic events tracing to meet the aim of geological structures analysis. Based on technologies such as coherent slice and horizontal section, structure framework in this whole area was summarized.Finally, traps in the study area had been divided into three levels, according to lithology, property and sedimentary facies of the reservoir.