Applied Mechanics and Materials Vols. 522-524

Abstract: In order to select favorable coal bed methane (CBM) areas in western Guizhou and Eastern Yunnan, 5 typical mining areas were used to estimate. Based on physical properties, reservoir capacity and coal geological features, coal reservoirs evaluation model was constructed through hierarchical fuzzy comprehensive evaluation method. The results showed that: coal reservoirs were divided into 4 types, and among them, type I was the best reservoir which was mainly distributed in the western part of Zhina and Gemudi, the southeast of Panguan, and the northern part of Enhong and Laochang.

Abstract: A general geologic sedimentation model for reservoir is made by carefully analyzing the inberent essence of depositional environmentand for clastic rocks of lake basin. The basic model in the streaming environment is composed of two basic facies units: one is the waterway facie and the other is non-waterway facie. The principal characteristics of developing geology and sedimentology have been outlined. It can be commonly used in developing under-producted reserves and raising recovery ratio in the highly developed oil fields.

Abstract: The marine sedimentary basin evolution was developed from Jinning movement in the Yangtze and the peripheral region. The continental basin had generated in Middle and Late Triassic. In the Late Proterozoic Early Paleozoic, the tectonic evolution of the phase development and evolution of the basin could be divided into three stages, namely Qingbaikou-Early Sinian, Late Sinian Middle Ordovician, and Late Ordovician Blog Silurian. Three important stages of evolution were Devonian-Early Carboniferous, Late Carboniferous-Early Permian, and Late Permian-Middle Triassic in Late Paleozoic-Mesozoic. Ancient southern continent of Asia had been further proliferation as the Indosinian movement in Middle and Late Triassic.

Abstract: Micro-pore characteristics and its control factors are analyzed according to mercury penetration, physical property parameters, flake observation and scanning electron microscopy, etc. Studies show that Chang8₁ reservoir is ultra-low permeability, its main pore types are intergranular pore and feldspar dissolved pore, its main pore throat types are low porosity, fine throat to micro-fine throat. Diagenesis stage of Chang 8₁ reservoir is situated in the diagenetic stage B. compaction mainly reduce the pore space, while the micro-cracks caused by compaction can be good reservoir space; ferrocalcite cement, Chlorite coating and kaolinite would destroy the reservoir space by filling in the primary pores and secondary pores; hydration of feldspar would destroy the reservoir space, while dissolution of feldspar would improve the reservoir space; dissolution of feldspar is the most favorable diagenesis.

Abstract: Effective comprehensive logging, seismic fine prediction of structure and sand body, analysis of remaining oil controlling factors and distribution, is the precondition for remaining oil development in high water cut oilfield during the middle and later periods of the development. Based on combination of fine well and seismic fine structure and sand body prediction research, this article analyzes main control factors and distribution regularity of remaining oil in the block. Through the analysis, the structure and reservoir heterogeneity affected the distribution of remaining oil in the Fuyu oil layer in the Chao 64 block, the distribution of remaining oil in the plane, interlayer and layer showed different distribution characteristic. The remaining oil mainly distributed in the reverse faulting footwall high structure position, injection production faultiness part, and micro range structural high position, inter well isolated sand body development area.

Abstract: Curvature, as a newly developing structural attribute, closely related to the bending of geologic body and received extensive attention of the researchers in recent years. Most positive curvature and most negative curvature in particular are widely used in fault detection and fracture prediction. In this paper, most extreme curvature was introduced into structural interpretation. Compared with the conventional curvature attributes, the advantage of most extreme curvature in fault detection was highlighted in this study. It not only clearly shown the property of fault, but also precisely indicated the location of fault plane and its variation along the strike by the dramatic change in curvature values. These findings contribute to better structural interpretation of 3D seismic data and are of great significance to hydrocarbon exploration.

Abstract: Qinhang Metallogenic Belt is an important metallogenic zone of copper, iron, and precious metals deposits, in China. On the basis of absorbing and summarizing the achievements in the previous researches, 5 kinds of gold metallogenic series are summed up. One of the most important series is Gold Metallogenic Series Related to Dynamic Metamorphism, of which the deposits are mainly distributed around Shaoxing-Jiangshan deep fault belt and have the characters of large amount and big reserve. The gold ores of other metallogenic series types are mainly associated with Pb, Zn and Cu deposits.

Abstract: The research is carried out on diagenetic minerals, pore types and its impact on the physical properties in Huanjiang C8₁ reservoir of Ordos basin, which is based on reservoir physical property test, thin sections observation and scanning electron microscopy. Several minerals closely associated with reservoir physical properties are identified from diagenetic effect views. It results in that a classification is proposed for the diagenetic facies, consisting of four kinds of diagenetic facies: ferroan calcite cementation facies, hydromica/kaolinite cementation facies, chlorite coating facies and feldspar dissolution facies. The study of C8₁ reservoir in Huanjiang region shows that this scheme is favorable to estimate low permeability reservoir, the result shows fairly good consistency with the distribution of physical property of wells.

Abstract: In this paper, the conducting model which is more suitable to describe the reservoir in the process of polymer flooding was selected, according to the reservoir properties. Based on the polymer solution conductance laws and the polymer flooding rock resistivity experiments, by injecting various types of polymers and water with different salinities, the rock resistivity change rule was studied. The change rule of the Archie model parameters in the polymer flooding process was analyzed and the accuracy of the dual water model was analyzed by means of the Litho-electric experiment data. On the basis of rock physical property analysis data, combined with the actual logging rules, the parameters interpretation model of porosity, permeability, irreducible water saturation and shale content were established. Using the core analyze data to contrast the practical application effect of the interpretation model, the result show that, the conclusion of the model corresponds to reality.

Abstract: The third section of Qingshankou formation can be divided into five subsequence groups in Xingxi oil field, including two in TST and three in HST. Using spectral decomposition techniques make it easy to predict the sand body decomposition. The sandstone lithology comparison on wells show a high degree of aggrement, indicating that the spectral decomposition techniques for the deposition of sand body prediction is a good way. However, this method can only play an important role in qualitative, not suitable for quantitative analysis.