Seismic Interpretation And Reservoir Prediction Of Yingcheng Formation In Xingshan Area

Located in the southeast deep structure rift zone of northern songliao basin, Xingshan area belongs to south part of Yingshan-Shuangcheng depression. The volcanic rocks of Yingcheng formation experienced intense tectonic movement, led to complex lithology, diversification of lithofacies, reservoir heterogeneity seriously and eruption volcanic rocks superposed in different stage. Under the relatively good geology condition, however, natural gas still could enriched hydrocarbon accumulation. Xingshan area is the main replace area of deep gas exploration after xujiaweizi region.Seismic interpretation and reservoir prediction of volcanic rocks is difficult. Based on the sequence stratigraphy, structural geology and the related theory of reservoir prediction, combined with the seismic, drilling and well logging and geological data, the prerequisite is to divide Yingcheng formation group into three cycle,6 stages and build up the equivalent formation framework,including 7 seismic reflection horizons(T4-1, T4 a, Tyc1 ax, Tyc1 a, Tyc1 bx, Tyc1 b, Tyc1cx). Meanwhile, we completed exact horizon structure maps by building 3D high precise velocity field. The characteristics of development and activity of fault in Xingshan area were analyzed. The control of fault on hydrocarbon reservoir was investigated.Combined the technology of seismic profile recognition, trend surface analysis,coherence analysis to make the fine characterization of volcanism and analysis the eruption process of volcanoes. The essay analyse the characteristic of flat layout features of volcanic facies through analyzing the lithofacies, seismic waveform cluster analysis and seismic attribute analysis. Based on these, using the three- dimensional curvature properties predict favorable zones for fracture development in the Xingshan region, and AVO attribute gives the gas-bearing condition in volcanic rocks.To reduce the superposition of different lithology, regional lithology is divided into andesite, dacite, rhyolite and sedimentary rock according to acid, alkali and granularity. The rock physics analysis showed that P-impedance, Lambda-Rho, Mu-Rho and Den are sensitive to distinguish the lithology and reservoir. The distribution rules of different lithology and reservoir of each stage were achieved by pre-stack elastic inversion and cross plot analysis. Finally, comprehend the information of construction conditions, the distribution features of volcanic mechanism and volcanic rock facies, fracture development zone, carry on the quality synthetic evaluation to the reservoir and predict favorable zones of volcanic reservoir,Based on the comprehensive interpretation of seismic data and reservoir prediction are studied, and following results are obtained. Reformation of the volcanic eruption gap effectively improved the physical properties of apricot mountain conditions. The migration and accumulation of hydrocarbon is importantly controlled by the controlling-depression fault. Xingshan area has great exploration potential,and its physical property is mainly controlled by volcanic institutions, volcanic facies. Volcanic reservoir of this area could be divided into vol-canic institutions, volcanic facies. Volcanic reservoir of this area could be divided into rhyolite and andesite, without dacite. Sedimentary intercalation mainly acts as the regional caprock. It mostly exist in cycle II and cycle Ⅲ which are mainly distributed around yingshen-1 well block, with these characteristics of multi-center of thickness, patchy distribution and controlled by the volcanic facies and fracture.