Longgang - Camp Mountain Ray Ray Four Mouth Slope Group Reservoir Characteristics Research

Focus on Lei-4of the middle Triassic Leikoupo formation in Longgang-Yingshan area, through the study of a large number of related literature,combination with outcrop, drill core and thin section observations, drilling and logging data, guided by the theories of carbonate sedimentology, reservoir geology, karst, use the methods of multi-disciplinary, multi-technology integrated analysis, accompanied by analysis of modern testing methods, for example, thin section analysis, scanning electron microscopy, trace element analysis, mercury analysis and so on, study the strara, sedimentary facies, diagenesis, reservoir type and characteristics, analysis the effect of sedimentary micro-facies and main diagenesis on reservoir; at last, elaborat the main controlling factors of reservoir development, established the main reservoir evolution model, forecast the favorable block of reservoir distribution.The study of the formation and sedimentary facies show that T2/4can be divided into T2l43T2l42, T2l41. T2l4can be divided into a, b, c three sub-member thin layer. Effected by Indosinan movement, the strara generally was eroded. Nanbu-Yingshan area is the center of the residual formation thickness, the residual formation thickness get thinner from west to northeast and southeast. Its sedimentary for a condined continental sea environment, can be divided into2subfacies and8microfacies, which dolomitite and limy dolomite, table point sands is the favorable microfacies belt.The best physical quality of rock type was are nite dolomite and oolitic dolomite, secondly is crystal grain dolomite in this formation. The major storage space is intergranular dissolved pore, secondly is intragranular dissolved pore and intercrystal pore. The major influent space is the fracture. The reservoir type is the fracture-porous one which has low-to-medium porosity, medium-to-high peameability. The chiefly constructive diagenesis of this is supergene corrosion effect. And now the ultimate result of the reservoir is under the process in mutual effect of the sedimentation, diagenesis and other factors.All in all, the reservoir is distributed in the T2l43in vertical, from the horionzal distribution,the range of profitability reservoir was around Longgang19-21-22-23-160-161-162-170-172and Longgang177-19-37,the other blocks are relatively poorer.