Advanced Materials Research Vol. 868

Abstract: Using high-resolution sequence stratigraphy theory and its technology, based on 22 well cores and 4 256 logging data, interface types and characteristics of different grades the base-level cycle in Putaohua oil layer of Sanzhao Sag was systematically analyzed, and Putaohua oil layer is divided into 1 medium-term base level cycle, 4 short-term base level cycles, 8 super-short-term base level cycles, established high-resolution sequence strata framework, and proposed sequence stratigraphy model of middle super-short-term base level cycles meridionally grado-thin and up to vanish with syndepositional structure lifting control in the south of Putaohua oil layer. Sandstone is offlap Pinch-out in the upper of Putaohua oil layer, and Sandstone is onflap Pinch-out in the under of Putaohua oil layer from north to south.

Abstract: China has huge Shale gas resources potential. The exploitation of shale gas can effectively reduce atmosphere pollution and relieve the energy shortage in China. The thickness, burial depth, organic richness and thermal maturity of Paleozoic shales in the different regions are studied and the favorable areas of shale gas are depicted. The most favorable formation for shale gas accumulations in Lower Paleozoic are Longmaxi and Niutitang shale and the favored regions mainly distributed in Yangtze area in southern China, the Tarim Basin, etc. The distribution of Upper Paleozoic shale gas mainly developed in Taiyuan and Shanxi formations in the Ordos Basin and North China. Through the comprehensive comparison, it is summarized that Yangtze area, especially in the northeast and southeast of Sichuan Basin, the west of Hubei province and the east of Chongqing province are the preferred choices for shale gas exploration.

Abstract: In order to carry out a more comprehensive discussion on shale gas accumulation conditions of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation, the distribution, source rock conditions and reservoir conditions of these two shales are comprehensively analyzed, these two shales are both have the characteristics of high organic carbon content, high maturity, appropriate thickness and mainly typeⅠkerogen as source rocks, and interbedded with siltstone and/or fine sandstone, rich in quartz and other detrital components, easy to break and form the cracks, micro cracks as reservoirs, these characteristics provide a favorable material basis and reservoir space for shale gas accumulating. On this basis, the effective distribution areas of these two shales are further determined and shale gas resources are preliminary evaluated, eventually come to the results of shale gas resources of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation respectively are 0.409×10¹²m³ and 0.389×10¹²m³.

Abstract: The Lower Silurian marine shale is widely distributed in Northwestern Hunan and features in a large thickness of dark shale showed at outcrops. However, the accumulation conditions and gas content is unknown. The sedimentary facies, thickness and distribution, organic matter types and content, maturity, reservoir properties and gas content of the Lower Silurian black shale in Northwestern Hunan were investigated by field observation, sampling and experimental analysis. The results show that the black shales sedimentary environment is deep water continental shelf, with featured in abundant fossil. The burial depth of the Lower Silurian black shale is 0-3000 m, and its thickness is 10-40m while the average TOC is 1.0% and average Ro is 2.9%. For the disadvantaged sedimentary facies and shallow depth, the maximum gas content of the Lower Silurian black shale from well site desorption test is 0.59m³/t only, but the result of isothermal adsorption simulate test show that the Lower Silurian black shale have a good adsorption capacity, and can generate a large number of shale gas in Northwestern Hunan where better deposition conditions and suitable depth exist in.

Abstract: Based on the Fuyang formation in Xingbei geological background research, to understand the basic structure of the study area conditions and the forming conditions. Combined study area forming conditions analysis, the study area as a whole basic understanding of oil-water distribution. Finally, the study area production test data, logging data interpretation and analysis of oil-bearing core, and thus the oil reservoir in the study area were evaluated in the study area in order to find favorable block.

Abstract: In order to research the relationship between the fracture and reservoir in the south beier sag, using the method of integrating theory with practice, Through research fracture development and system partition and anatomy of the reservoir shows that the fracture on the formation of the reservoirs mainly the following two aspects, First,the fracture provides migration conditions for oil and gas namely 1 early extend fracture make 1st member of Nantun group surcerock and the south 2nd member of Nantun group reservoir side joint, which is beneficial to oil lateral migration; 2 the long-term development fracture for secondary reservoir formation provides favorable conducting channel; Second, Fracture provides shield condition for oil and gas accumulation, namely 1 reverse fault "back on" low uplift area native reservoir accumulation are controlled; 2 reverse fault - fan control assembled parts of the secondary hydrocarbon reservoirs.

Abstract: Qijia-Gulong concave slope area is a succession nose shape structure slope as well as Qijia-Gulong depression of Songliao basin developing process, Putaohua formation is most important contains oil goal formation in this area center lower part to contain oil combines, since long ago, the forming law is not unclear to be recognized, based on the theories and means of sedimentology, sequence stratigraphy, petroleum geology and so on, from the fine research of palaeostructure, sequence frame work sedimentary facies, forming period, hydrocarbon water distribution, trap type, and generalize on hydrocarbon forming pattern and enrichment law, pointed out new objects and orientation of exploration and development, had important instruction significance of hydrocarbon genesis of Qijia-Gulong depression.

Abstract: This project aims at the phenomenon of increasing injection pressure of injection wells of the Tong Liao Uranium SW-8E test wells group, carries out the research of reservoir choke and broken down. By analysis of the water quality of injected and produced fluid through the test wells, scaling prediction, physical simulation experiments and other research, we find the main cause of clogging injection wells: Bacteria blockage, scale blockage, solids blockage and reservoir clay swelling blockage. Meanwhile according to the main reasons of reservoir pollution we have carried on pointed research of broken down, excogitate a better integrated and targeted reservoir choke Blocking Remover. Through on-site implementation, the injection pressure is reduced by 0.3-0.4MPa (maximum allowable injection pressure is 2.0MPa), well purge period is extended from three days to three months, this project solves the problems and achieves very good results.

Abstract: The Xiongcun district is located along the south margin of the Gangdese porphyry copper belt, approximately 53 km west of the Xigaze. No.III deposit is a newly discovered porphyry copper-gold deposit in the Xiongcun district. This paper first reports geological characteristics and exploration potential of No.III deposit. No.III deposit is hosted by Early Jurassic hornblende quartz diorite porphyry. Pervasive alteration is dominated by a well-mineralized potassic alteration. Major ore-bearing vein types include quartz-sulfide and chlorite-sulfide veins. Drilling holes and geochemical anomaly indicated the No.III deposit has excellent potential for exploration.

Abstract: Deposit reserves have a role in regulating the development and utilization of mineral resources. Its core is to secure the supply of mineral resources by selecting the right sequence and optimizing the layout of mineral resources E&D. this paper devised a measuring model for the deposit reserves . Following the principle of store up in bumper years to be in ready for hard ones, and considering the particularities of deposit reserves. we concluded that: For the advantage of mineral resources, regulating reserve can realize resource advantage to economic advantage, therefore the reserve object should focus on mining right reserves. Finally, we incorporated three recommendations for the nations effort in deposit reserves: make special plans for deposit reserves, establish an organizing and leading body for deposit reserves and structure a mineral reserve system.