Applied Mechanics and Materials Vols. 522-524

Abstract: This paper aims to Cretaceous bottom conglomerate facies of Xinjiang Ludong area of China research to elucidate the deposition pattern analysis phase, as well as the use of methods. Methods first take logging combined with tectonic pattern and sedimentary background, division comparing in Ludong area of Cretaceous basal conglomerate unit. Secondly, the application of modern sedimentology theory, method, system analysis of lithologic characteristics of this area and sedimentary structure feature. According to the logging facies analysis, summarized the various sedimentary facies marks, distinguishing different sedimentary types, ultimately determine the sedimentary facies.

Abstract: The fractured reservoirs will inevitably become a significant field as the focuses of oil and gas exploitation are gradually shifted from shallow exploitation to deep one and from conventional reservoirs to unconventional ones. This paper has done a lot of study to do with the prestack seismic gathers in the HSX region, such as processing of the prestack preserved amplitude, stacking of the sub-azimuth, migration and forward modeling of the fracture segments and fracture prediction of structural causes based on the analysis of the stress fields. The paper has also detected anisotropic fractures according to the prestack azimuth AVO and QVO characteristics in this region and finally predicted the direction and density map of fractures in the HSX region.

Abstract: Luziyuan lead zinc iron metal mining area is located in the south of Baoshan-Zhenkang lead, zinc, mercury, rare metal mineralization belt of the southwest Sanjiang metallogenic belt.According to the mine tunnel drilling and logging data, that the ore bodies are controlled by strata and faults, symbiosis and Dali rock, limestone, near ore wall rock skarnization strongly, the research shows that the deposit belongs to sedimentary transformation - skarn Pb Zn Fe polymetallic deposit. [ Mining area within the range of 1:50000, 1:50000 gravity measurements of soil geochemical survey, combined with the large scale mapping of data discovery lead zinc iron copper resources are expected to find in the eastern Luziyuan area Mangxi - Head Mountain Luojiazhai resource replacement area.

Abstract: Paleostress value, fractural porosity and fractural fractal dimension could be used to demonstrate the basement rock reservoir of buried hill in oilfields. The paleostress value determined the development of the reservoir fractures. Fractured types are recognized and fractural porosity is calculated by using bilateral logging data. Then the fractural fractal dimension is calculated by using seismic data to predict the distribution of fractured zone. Finally based on paleostress value, fractural porosity and fractural fractal dimension, fractured reservoir of buried hill is evaluated by using fuzzy mathematics.

Abstract: The exploration practice in NanPu Sag suggests that shale oil&gas as an unconventional natural gas resource,is a kind of current alternative energy resource. According to measured data of geochemistry,mineral,logging and drilling on the Palaeogene strata in NanPu Sag,the shale in palaeogene characterised by large thickness,high abundance of organic matter, favorable types and wide range of thermal maturity, shows that it has the material basis for the formation of shale oil. In addition,the shale of palaeogene in NanPu Sag generally developed fractures,which has fine reservoir property. The shale in this area has high content of brittle minerals which are useful to later fracturing reformation. It is thought after comprehensive analysis that shale oil&gas of paleogene in NanPu Sag has a bright prospect in exploration and development.

Abstract: In light of complex lithology and serious heterogeneity of carbonate reservoir, the paper presents a comprehensive study of petrophysical characteristics of it. By using available well log data and fuzzy mathematical method, a lithologic model for identification of carbonate reservoir is developed. According to recognized fractural types, a model for fractural porosity interpretation is established. By way of correction of small core sample using big sample, relationship between core porosity and effectively estimated well log porosity is built up, obtaining effective porosities. Using different fractural types and dual lateral log data, a model for fluid saturation explanation is set up. Furthermore, these models and measured information are used for feasibility evaluation of them, reaching higher consistency and satisfied results.

Abstract: In fractured reservoir, the capacity of oil storage and production depends on the degree of fractures development. Therefore, the research of identifying reservoir fractures has become more important in the petroleum industry. By the research of fractures identification methods in geology, logging and seismology,the paper explains the features and advantages,disadvantages of each method. The study shows that a single method is not enough to solve problem in current conditions , the comprehensive use of various methods is required.

Abstract: Through core observation and description, whole rock chemical analysis, thin section identification and logging identification method, The volcanic rock of this area is mainly basalt, trachyte and tuff, three major categories, further divided into 10 subclasses. Basalt intergranular-intersertal structure, the main minerals are plagioclase , sodium feldspar and mafic pyroxene , belong to alkaline series,infrasonic wave, low natural gamma, high resistance, high density; Trachyte ,typical rough structure, high content of feldspar, the negative anomaly of naturalelectric potential, high resistance, high natural gamma measurement, infrasonic wave;Tuff, tuffaceous texture, massive structure, rock is composed of lithic, vitric, crystal and volcanic ash, ingredients to alkali feldspar, biotite, plagioclase etc, low natural gamma, low resistivity , low density.

Abstract: In hailaer basin as an example, the paper discusses the types, characteristics, forming conditions and petroleum geological significance of the inversion-phase structures. It is summarized that the characteristics of the three structural types. Non-superimposed newborn extrusion structures, positive inversion structures, and twisting inversion structures, forming in tectonic inversion period of the basin. It also analyzes the forming conditions of the three. The forming conditions of former is the existence of strong extrusion stress field, has not suffered deformation or slight deformation of rock zone in synrift period, and that there are deep and shallow slip planes in the basin. Points out that the inversion-phase structures are the main trap types in extensional basin,that the tectonic inversion period is the mass period of oil and gas migration, which have good matching relationship with inversion-phase structures. Therefore, the traps provided by the tectonic inversion as the most favorable oil and gas gathering place.

Abstract: As a new kind of deposition system, the shallow-water delta deposit is accepted increasingly by exploration workers in Bohai oil field. In the oil-gas exploration process, more and more evidence about the existence of shallow-water delta was discovered, such as palaeophyte, mudstone characteristic, log response and so on. From the perspective of sequence stratigraphy, the author of this article analyze the causes of shallow-water delta and think that the water-depth change is the major factor that control the throughgoing of shallow-water deltaic sands body; And summarizes the unique characteristic of shallow-water delta which is different to the common delta deposit. Compared to the traditional fluvial sediments, the deposition system of shallow-water delta has better combination of reservoir and cap and superior condition of oil and gas accumulation, and provide more reliable safeguard to shallow layer oil-gas exploration, especially to lithologic reservoirs exploration.