| Oil and gas transportation system connecting to source rocks and traps, controlling the direction and scale of migration was one of the most important elements of Petroleum Geology study. At this moment, a large quantity of oil and gas reserves is found in Tainan sunken Triassic SAG, Turpan-Hami basin, where most of the oil is gathered outside the source which needs sand, non-integrated or rupture system communications and carrier system such as migration and fracture to form. Therefore, this paper is focused mainly on research about sand, without integration and combination of breaking their own delivery capacity and regularity, its carrier role played by oil and gas accumulation process; and then summarize the accumulation patterns and prediction of favorable place for petroleum accumulation belt. Finally, a reference for further oil and gas exploration and development work in Tainan SAG is provided and discussed.In this paper, physical characteristics and influence factors of sand are studied based on research of sediment transport and deposition distribution and mud logging, logging and laboratory analysis of casting thin sections and physical tests. Meantime, the author uses statistical distribution characteristic of faults to study its effects on hydrocarbon process,using fractal theory to analyze the relation between faults and oil-gas accumulation. In addition, seismic interpretation and analysis of single well data study of unconformity type and distribution characteristics of unconformity under established models to analyze judgment not of integration effects on physical properties of formation. Finally, the crude oil physical property data of oil-gas migration direction, and reproduction using numerical simulation method of hydrocarbon migration path, sums up oil and gas accumulation pattern and prediction of favorable place.The paper, based on series of studies, obtains several statements as follows:1 、 Tainan sunken Triassic sandstones are important transport layers. Its lithology is mainly fine-oriented, and sedimentary environments are dominated by braided Delta plain.Reservoir physical properties mainly in the hole-high porosity, low-high permeability-super high permeability reservoir. Digenetic stages in early digenetic stage a, stage b-late digenetic stages.2、High sand contained reservoir is effective with preserve and other sandstone layers cannot be used as reservoirs. By analyzing the section small layers of distribution and hydrocarbon-bearing sandstone summed up the relationship between effective transmissionconductors of the lower limit, "oil + oil full of" thickness limit of the pore space is11.3M, "oil stain + oil + fluorescence" thickness of the pore space is 7.5M.3 、 The faultage connects with source of reservoir. And its impact on hydrocarbon accumulation in closed and open the result, fractal of faults results show that current oil and gas distribution concentrated in the area of the box-counting dimension is greater than1.505.Partial unconformity on reservoir physical properties has improved, easy to form oil and gas. By Sands, faults and unconformity formed of Triassic oil and gas transportation system in Tainan SAG space frame.4 、 Oil and gas mainly come from Permian strata in taibei SAG, and spirit communication faults up to long distance migration of Triassic. There are two main migration paths: one is the distance along the sand from Northwest to East migration of tectonic ridges;Second, cross-fault short distance south from the Northern reservoirs. Most favorable into Tibetan areas for oil and gas flame mountain fault zone and in likening fault step zone. |
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