The Study Of Complex-Reservoir Logging Fine Interpretation Procedure

With the continuous deepening of petroleum exploration, the exploration target is gradually diverted to districts where the reservoir geologic condition is comparatively complex. The quest-for-oil and exploration target for Jilin prospect area also become more and more complex. At present, the beds of interest for quest for oil mainly concentrates on thin-interbedded lithologic deposits which are more concealed or lithologic deposits which are formed from thickbedded near-source coarse fragment glutenite container rock. In the condition of quick drilling, these exploration targets make many difficulties to logging to find shows of oil and gas and to evaluate& interpret oil, gas and water reservoirs.As for the concealed thin-interbedded lithologic deposits in Songliao Basin, we've been puzzled about the technical problem which is to know and evaluate high-show water yield formations for many years, which has a strong impact on the enhancement in the coincidence rate of logging integrated interpretation. Combined with the logging scientific payoffs in recent years and on the foundation of systematically summarizing sorts and evaluation methods of high-show water yield formations in Jilin prospect area, we emphasize the research of evaluation method of bound-oil high-show water yield formations which are formed by low-porosity & low-infiltration aleurolite-packsand container rock. which has been well settled in Jilin prospect area by introducing nuclear magnetic logging evaluation technology and applying nuclear magnetic logging spectral configuration.the gas survey data are very important in logging finding and valuating hydrocarbon reservoir. So how to make good use of applying gas survey data in evaluating complex hydrocarbon reservoir become very important. The project team, through research, applies the largely distributing regional marked bed in the southern part of Songliao Basin which is oil shale layer in Nengjiang formation and Qingyi member to establish the new method of gas survey evaluation in this area - the method of gas-survey marked-bed ratio, that is, to evaluate oil and water with the ratio of crest value of gas survey in show layer and that in marked bed and get obvious effect.Yitong fault trough is the major district for increasing reserve volume and producing rate in Jilin oilfield. The complexity of the fault basin make many difficulties for logging evaluation: on one hand, near-source coarse clastic sedimentary rock is mainly glutenite which causes low level of sieve residue log show and the assay value of geochemical logging on the low side, which make difficulties to evaluation; on the other hand, it's hard to evaluate the high-show container rock and the capability of produced fluid of the remote-source fine clastic sedimentary rock.As to the large suite of coarse fragment container rock in Shuang'er member of near-source coarse clastic sedimentary rock, glutenite has coarse grain and sieve residue log can't log cementing matter, which effect the definition of the shows of bit cuttings and assay value of geochemical logging while can't affect the gas survey logging. Aimed at such circumstance, this article is established in gas survey logging. Through component analysis, we find that the component of gas survey in this district is more complete combined with that in the middle-shallow layer in the southern part of Songliao Basin, so that we introduce the method of gas-survey hydrocarbon, i.e. 3H method, which well solve the evaluation problem in the large suite of glutenite container rock and improve the logging interpretation evaluation precision.For the glutenite container rock, cementing matter is loosen and sieve residue log only logs clastic particles and hardly cementing matter, which leads to low assay value of geochemical logging and accurate evaluation can't be made for container rock. This article, through separately analyzing and comparing the assay value of geochemical logging of clastic particles and cementing matter, establishes linear relation and geochemical logging hydrocarbon recovering method, so that geochemical logging fine evaluation is replied in glutenite container rock.