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On Upper Paleozoic Subtle Gas Pools In Tabamiao District

Posted on:2006-01-02Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z X YuanFull Text:PDF
GTID:1100360185969917Subject:Paleontology and stratigraphy
Abstract/Summary:PDF Full Text Request
The characteristics, pool types and distribution patterns of upper Paleozoic subtle gas pools in Tabamiao district are expounded comprehensively and systematically based on the following research work on the domains around the new focus of reservoir accurate and detail description, reservoir prediction, productivity prediction and geological models of gas enrichment and high productivity in order to enrich the geological and evaluative theory of subtle lithologic gas pools of tight sandstones and to guide gas exploration.1. Accurate and detail stratigraphic division and correlationBased on the analysis of lithology, electrical property, depositional mark, paleontology, cyclothem and combining with "Mark of marine carbonate rock (k1)","Mark of the tops if main coal bed and coal series (k2,k 3)", and "Mark of marine flooding surface ",the upper Paleozoic strata of target are divided and correlated into member, laying foundation for the following research .2. Research on Sequence stratigraphy and sedimentary microfacies.The development models of regional sequence stratiraphy and marks of regional sequence of strata Paleozoic of northern Ordos basin in upper are built, subfacies distribution of Taiyuan formation of Carboniferous, Shanxi formation and Shihezi formation of Permian in Tabamiao district are studied and the characteristics of sedimentary microfacies of different formations and their distribution are further researched. Frame of Upper Paleozoic sequence stratigraphy in the north of the basin is built and oil measures of target are correlated using facies-control and isochronous method, especially the correlation frame of oil measures in Taiyuan, Shanxi and Lower Shihezi formations in Tabamiao district, in order to lay foundation for defining the distribution of large or middle scale lithologic gas traps. Main research contents are:(1) Cores and log curves are studied seriously according to the situation of this area. Criteria and principles of stratigraphic division and correlation are determined for the units smaller than formation according to Cross's theory and method of high resolution sequence stratigraphy which takes base level cycle as ideology. Division plan of chronostratigraphy and sequence stratigraphy in the research area is proposed through the research on the types and characteristics of different rank boundaries. The types and characteristics of short-term, middle-tern and long-term cycles are studied though accurate and detail correlation. Frame of sequence stratigraphy is built based on summarizing their textural feature, forming condition, composition of lithology and lithofacies and distribution.
Keywords/Search Tags:Tabamiao district in Ordos basin, Upper Paleozoic, accumulation characteristics of subtle tight sandstone gas pools, reservoir prediction, factors affecting productivity of gas pools, Productivity prediction
PDF Full Text Request
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