The Forecasting Of The Volcanic Reservoir Of XingCheng

Recent years exploration practice indicates the exploration prospect in Ying1 and Ying4 Formation of Xingcheng basin is extremely optimistic. The in-depth structure and lithology growth is extremely complex, therefore prediction of the volcanic rock reservoir distribution is especially difficult. based on carefully analyzing and referring the forward research fruits sufficiently using the data of seismic, well logging and well drilling, adopting several methods, this paper prediction and researches the volcanic reservoir at the objective of Yingcheng formation in Xingcheng.Through the interpretation of target stratum, the YingchengI formation are widely distributed in the region of interest except the north lost, the Xingcheng structure formate is that the north is arched structure and that the south is fault depression and that the west is step fault depression.Through the research of the lithology, lithofacies and the relations with the accumulate room of volcanic reservoir, and combinded with the well drilling data of Xingcheng, it is sure that the porosity and the permeability of the rhyolite and the welded tuff, the upper subfacies of effusion facies and heat clastic subfacies of burst facies in this area is often high and those physical property is favorable.In view of YingchengI formation, beginning with the seismic identify of the volcanic reservoir, using the technique of 3D visualization and coherence, 10 volcanic edifices in the target stratum are forecasted, using the technique of the seismic inversion, this paper forecasts that there are two areas in which the thickness of the volcanic reservoir is high-value. Based on these, taking analysis of the section and the plane, it can be found that: the volcanic of YingchengI formation is destributed widely in the region of interest, the total trend is that the thickness value of north is low and that of south is high, that of west is low and that of east is high; The growing of the volcanic reservoir is affected largely by the volcanic edifice, the volcanic facies belt, the fault and the depth of burial, it is usually that the burst facies and the effusion facies are main, and the area near the fault is vegetal, the physical property is favorable and the thickness is high.At last, through analyzing the distribution rule f the deep gas reservoir of Xingcheng, combinding with the forecast fruit of the volcanic reservoir and the test gas fruit of multiwell, the distribution of the beneficial areas are pointed out in YingchengI formation.