COMPREHENSIVELY UTILIZING 3-D SEISMIC DATA FOR INVESTIGATING LITHLOGICAL TRAPS
Gas I · Tianranqi gongye · 1999
Because the 3-D seismic exploration is of many advantages as high density acquisition,high fidelity and various flexible display modes,etc.,it has been an objective demand for oil and gas exploration to utilize the 3-D seismic data for investigating lithostratigraphic change,predicting the direction of sources,delineating sedimentary systems and sedimentary facies,seeking for sandstone developed areas and evaluating favourable oil and gas bearing areas.The 3-D seismic exploration working area involved in the paper is located at the west part of Taibei depression in Tuha Basin.Before the reservoir studies were carried out,four wells had been drilled in the area,producing only little oil and gas,which couldn′t be satisfied certainly.For this reason,the lithological trap investigation has been carried out on the basis of full 3-D seismic migration data.According to the geological properties of the 3-D seismic exploration working area,in combination with the drilling and logging data and by use of the methods of seismic microfacies,sedimentary microfacies and reservoir formation condition analysis etc., the planar distribution of sandstone bodies is delineated,the subtle lithological traps are predicted and the beneficial targets for the oil and gas exploration in this area are pointed out in the paper.