Advanced Materials Research Vol. 868

Abstract: By using seismic, logging, test oil data, based on the analysis about development characteristics and movement stages of faults, and their control to the deposition of Fuyu oil layer, this paper studied the control of fault belts to hydrocarbon accumulation and characteristics of hydrocarbon migration and accumulation in different fault belts. Study shows that the faults of Fuyu oil layer are made up of middle and long-term faults, which are mainly formed or active in the early deposition of Qingshankou Formation, in a plane the faults are dense to be in belt by the control of basement fault. The distribution of sand bodies and strike of distributary channel of Fuyu oil layer is controlled by basement fault and long-term growth fault, there are three spatial combinations between fault belts and distributary channel:Low-angle intersection, High-angle intersection, and distributary channels long-distance extension along the fault belt in the upside of the boundary fault. The spatial combinations between fault belts and sand bodies determine hydrocarbon migration way and its accumulation in the fault belts: in the eastern hydrocarbon is transported by transporting fault-sand mode, the traps within and besides the fault belt communicated by transporting passage are both accumulated by hydrocarbon, in the western hydrocarbon is transported by boundary fault-sand mode,the oiliness becomes gradually poor from both sides to the inter of fault belt.

Abstract: Integrated employment of wireline logging and seismic data, turbidite fan types and distribution characteristics were analyzed in the Paleogene strata of the second Member of Dongying Formaiton. The results showed that: the study area developed many types of turbidite fan, including the slump turbidite fans, deepwater turbidite fan, steep nearshore turbidite fan, far shore slope turbidite fan, etc. There are significant differences in the developmental environment, sedimentary characteristics, the main factors and so on. The differences in delta size, provenance, ancient terrain and triggering mechanism affect the development of different turbidite fan deposits. By identifying wireline logs stacking patterns, the external geometry and internal reflection structure of seismic events, the types of lacustrine fan identification modes were determined. And also with three-dimensional seismic attribute analysis techniques for predicting sublacustrine fan and determining the plane distribution, it provide basic geological evidence for lacustrine fan hydrocarbon reservoir exploration.

Abstract: As the escalating hotspot and key object of hydrocarbon exploration, research of shallow-water delta deposits in China have made breakthrough in both in production and efficiency. Numerous results in Bohai Bay Basin show that the conditions of shallow-water delta sandbodies are widespread in late Paleogene and Neogene. In this paper, we analyzed the geological evidences, deposition microfacies and favorable reservoir conditions from structural phases, palaeontological characteristics, depositional characteristics and geophysical characteristics (stacking patterns of wireline logs and seismic reflection characteristics). The results indicate that shallow-water delta deposits usually develope in shallow-water area where exits flat and broad terrain, arid and hot paleoclimate, turbulent lake level and ample provenance. As for the reservoir conditions, rivers brought large amounts of organic matter and minerals into the lake, which aided in bringing up organisms. All these organisms provided basis for petroliferous source rocks. The mudstone layers developed above the shallow-water deposits which helped to form vertical patterns of reservoirs. These conditions determine that shallow-water delta deposits consist of excellent reservoir combination, various types of traps, sufficient source rocks, smooth migration pathways, which provided broad exploration prospects.

Abstract: There are several geological factors affecting the accumulation of CBM, including tectonic condition, burial depth, coal thickness, coal rank, gas content, permeability, reservoir pressure, desorption pressure and hydrological condition, etc. This article analyzes the influence of tectonic characteristics on the accumulation of CBM in H area, combining the tectonic characteristics and the actual production data, finally conclusions can be drawn that the uplifting movement of crust after coal-forming period could break the original adsorption equilibrium, then CBM would escape under unfavorable preservation condition; different scales of fractures and folds formed by tectonic movements play an important role in the preservation and dissipation as well as in the enrichment and accumulation.

Abstract: Based on the data of coalfield drilling and geological information, using the back-stripping technique, the subsidence history of northern Qinshui basin is studied in this paper. The study shows that this area experienced three stages of subsidence and two stages of uplift since Permo-Carboniferous period. It subsided slowly from Late Carboniferous to middle Permian and then subsided rapidly from Late Permian to Triassic period. It uplifted and denuded from Jurassic period to Cretaceous because of Yanshan movement and continued to uplift and denude since Cenozoic because of Himalayan movement and then subsided from Neocene to Quaternary period. The subsidence center mainly migrated from the south to the north since late Paleozoic. The denudation in the east is more than in the west and the largest denudation thickness is over 1000 m.

Abstract: Ordos Basin is the second largest sedimentary basin in China with very rich oil and gas resources. The exploration targets are typical reservoirs of low permeability, low pressure and low output. To determine the accumulation mechanism of tight sandstone reservoir, thin section, fluid inclusion, porosity and permeability measurement, numerical calculation were used. The result showed that sandstone became tight while oil filling, buoyant force is too small to overcome the resistance of capillary force. Therefore, overpressure induced by source rock generation is the accumulation drive force.

Abstract: Ordos Basin is the second largest sedimentary basin in China with very rich oil and gas resources. The exploration targets are typical reservoirs of low permeability. To determine the accumulation mechanism of tight sandstone reservoir, thin section, SEM, numerical calculation were used. The result showed that sandstone should be ultro-low permeability reservoirs with the high content feldspar and lithic arkose or feldspathic litharenite. The reservoir became tight while oil filling, buoyant force is too small to overcome the resistance of capillary force. Therefore, overpressure induced by source rock generation is the accumulation drive force.

Abstract: Based on comprehensive study of the thin section identification, X-ray diffraction analysis, scanning electron microscopy, the heavy mineral analysis data, the lithology of Donghe sandstone reservoir in HD4 oil field, Tarim Basin, is mainly lithic feldspar-porphyry sandstone, fill in the gap content with calcite, shale and anhydrite primarily. The area that is far away from the source, and the original rock are sedimentary metamorphic rocks. Pore types are primary interparticle pore, inside particles dissolve pore and fissure pore. Clay mineral are mixed by Chlorite, illite and kaolinite.

Abstract: Through mass change calculation of the bauxite in the Wuchuan-Zheng^, an-Daozhen (WZD) area to reveal the migration regular of elements in the ore-forming process: major elements all have loss except aluminum element which keep steady in the ore-forming process of the WZD bauxite deposit; Major elements in the upper and middle part of the profile have a large scale of runoff, in the lower part of the profile just have a small scale of runoff, and some elements concentrated in the lower part of the profile, above all of these shows that major elements have a downward moving trend. Alkaline metal have the largest scale of runoff demonstrated that the ore-forming environment is acidic.

Abstract: Three-dimensional models of deposit are the foundation of realizing digital mineral deposit , with the aid of mining software Surpac,it can establish deposit database, the three dimensional model of the mining surface,,orebody and roadway of the yunnan white cow factory silver polymetallic deposit.The 3D model can show the vivid image of the mining topography and geomorphology, ore body position, gallery situation. The ore model of orebody grade founding by kriging can show the distribution change of orebody grade clearly, and finally estimate the amount of ore body. Comparing with the traditional estimation method of exploration report, we can find the estimation of mineral resources by software is accurate.