Research On Reservoir Prediction And Hydrocarbon Accumulaiton Of Carboniferous Volcanic Rock In Niujuanhu-mabei Block.

In this paper the Niujuanhu-Mabei Carboniferous volcanic comprehensively utilized ofcore observation, lamella analysis, well logging, seismic and reservoir characteristics of theanalytical applications, integrated to complete the effective area volcanic reservoir predictionand volcanic rock reservoir Regularity.The Carboniferous Haerjiawu group is divided into two cycles, four times whileKalagang group is divided into1cycles,4times. In the Niujuanhu-Mabei main in thedevelopment of the intermediate-basic of lava and volcanic elastic rocks two categories(including lava44.91%, volcanic clastics55.09%)34kinds of small classes,the overallperformance of mainly basalts followed by andesite class, there is a part of the basic transitionlithology. Seismic characteristics of Malang depression Carboniferous volcanic reservoirs involcanic facies: overflow facies,eruption facies, volcanic sedimentary facies, volcanicchannel facies, and volcanic extrusive facies. According to the description of16well coreobservation, and28wells of ordinary, casting lamella obtained Malang depression theCarboniferous Kalagang group volcanic rocks of reservoir heterogeneity and strong effect.Thereservoir heterogeneity, reservoir space types, complicated pore structure, secondary effect isstrong characteristics. Including native aperture and secondary pores and sew the twocategories. The study found that the Kalagang group low-permeability reservoirs, porosity,belong the Haerjiawu group belongs to the medium and low porosity low permeabilityreservoirs. Overall the study area of volcanic rock containing oily overall to volcanic brecciaand basalt best, andesite take second place, rough surface rocks, tuff, tuffite worse。Research shows that: Kalagang group weathering place development of the reservoir isinternal sag, volcanic eruption times to C2k1-3, C2k1-2two times of reservoir in mostdevelopment, C2k1-1, C2k1-4two times as C2k1-3overall reflect, C2k1-2; Haerjiawu and thegroup C2h1-2C2h2-1, development of the reservoir is the best, C2h1-1times, C2h2-2. Overall,Kalagang group reservoir is the group with Haerjiawu. Effective reservoir developed alongthe weathering crust and volcanic edifice with a zonal distribution.Study found that, the reservoir type includes not integrated reservoirs, lithologicreservoir type, lithologic reservoir and volcanic rock type structure-the insider type reservoirs.Distribution of oil and gas reservoirs is mainly along the three eroding line (P2l, P2t, T2+3)near the enrichment of high yield. A combination of the research has done on theNiuquanhu-Mabei carboniferous volcanic rocks in the favorable zones on the forecast.