The Fine Description Of Reservoir And The Distributing Of Remaining Oil Of The Upper S₂～(2+3) In Southern Pucheng

Considering the geological characteristics and development of thick andheterogeneous block reservoir of upper S22+3 in southern Pucheng oil-field, applyingexploration and development data, guided by the theory of petroleum geology,sedimentology, reservoir geology, development geology, and reservoir engineering,adopting the technical means of high-resolution sequence stratigraphy, reservoir 3Dmodeling, ANN and reservoir numerical simulation, fine description and distribution of theremaining hydrocarbon of upper S22+3in southern Pucheng oil-field have been studied, adevelopment is proposed.Based on the research of the tectonic formation and evolution, applying computer and3D visual modeling technology, the fine structural of upper S22+3 has been studied, a fine3D structural model and a large-scale (1:5000), small gap contour micro tectonic graph arepresented, the recognizing of the minor fault growing distribution and low-amplitude microtectonic are discussed. Analyzing the background and characteristics of sedimentary andcore, the micro facies of the formation are studied. The conclusion is that this area is at thefrontal delta zone, micro facies are mainly braided channel(distributary channel),inter-channels, sand sheet, and shallow-lake facies, the main reservoir sand is river sandand the rest is of channel and sand sheet. Applying high resolution sequence stratigraphy,the high resolution sequence stratigraphy hack is concluded. Comparing the frameworkprofile, Upper S22 is divided into two medium-term cycles and 9 short-term cycles. UpperS23 is divided into two medium-term cycles and 10 short-term cycles. This is very helpfulfor fine reservoir description. Considering the high shale content, poor rock difference andlitho-electric, difficult physics interpretation in this area , a better reservoir interpretationmodel for this area is presented by using the calibrated logging , BP calculation and singlewell sectional physic interpretation. Analyzing the attributes of the formation, theheterogeneous interpretation is studied. The conclusion is upper S22+3 is stronglyheterogeneous for intra-layer, weakly heterogeneous for inter-layer and plane of middlepermeability, the inter-layer treatment is the main task for development. The 3D geologymodel for southern upper S22+3 is build by applying 3D geology modeling.Calculating the geology reserves, the flow unit is evaluated on reserves and the qualityand semi-quantity research on macro remaining hydrocarbon is discussed. Themicro-remaining hydrocarbon distribution, control factors and formation mechanism arealso studied. A pore throat net simulation model for southern upper S22+3 is built andsimulated, this simulation shows the movement and distribution characteristics of theoil-water in the flow field with different water cut and different models, which is necessaryfor remaining hydrocarbon analysis and development. On the research of macro and microremaining hydrocarbon, the reservoir numerical simulation, quantitative research anddistribution of remaining hydrocarbon are discussed, the further development is proposed.This research suggested a way of remaining hydrocarbon distribution and developmentby fine reservoir description for heterogeneous thick block reservoir at high water cut, thistechnology is very effective to improve the development and recovery for upper S22+3 andalso very helpful for the similar reservoir development.