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The Study On The Depositional System And Sand Body Spreading Regularity Of Upper Paleozoic In North Ordos Basin

Posted on:2005-09-12Degree:DoctorType:Dissertation
Country:ChinaCandidate:S T FuFull Text:PDF
GTID:1100360155458542Subject:Paleontology and stratigraphy
Abstract/Summary:PDF Full Text Request
Ordos basin is one of the most potential gas reservoir region in China and Upper Paleozoic is the important exploration horizon. Aiming at the character of low pore, low permeability, low abundance, wide distribution and distinct heterogeneous attribute of subtle gas reservoirs, we apply the basic theories and methods of Sedimentolgy and Sequence Stratigraphy, and use data of core, well logging, field section combining with results of seismic interpretation and testing gas or exploitation to research sedimentary system character, strata and sequence division and correlation, sandstones distribution character in main area of North Ordos Region, in order to discussing main control factor of forming and distribution character of gas reservoir in this region, and offering important basic data to farther gas exploration and exploitation in Ordos Basin. At the same time, these research results have the important effect to theory research and practical exercise of subtle gas reservoirs and sequence stratigraphy.By the above research, we acquire the following important advance and innovation:By the observation, description and correlation of outcrop and well lithologic section and research of rock association, sedimentary petrofabric, section structure and evolution sequence, we divide strata of Benxi formation in the upper Carbonic to Shihezi formation in Permian into three kinds of sedimentary system association, six kinds of sedimentary system, nine kinds of sedimentary facies and many kinds of subfacies and microfacies. The important sedimentary types in this region are alluvial fan, braided rive and lake delta, and delta plain is the widest distributing sedimentary subfacies.According to the theory and method of high resolution sequence stratigraphy which is based on the base level cycle putting forward by Cross, we define the division and correlation standard and principle of srata grading below formation in this region. At the same time, we research type and character of different grade interface, and conclude five genetic grade of division and three kinds of well logging facies association of sequence stratigrapy interface.Based on analysis of fine sedimentary facies and high resolution sequence stratigraphy to outcrops, well loggings, cores and combining with other research results, we first divide and correlate the chronology strata and sequence strata of Taiyuan formation in the Upper Carbonic to Xiashihezi formation in the middle Permian, and divide them into three supper long sequence cycles (SLSC1-SLSC3), eight long sequence cycles (LSC1-LSC8), seventeen middle sequence...
Keywords/Search Tags:North Ordos Basin, Upper Paleozoic, sedimentary system, division and correlation of sequence stratigraphy, sequence-lithofacies paleogeography mapping, sandstones distribution character, gas accumulation effect, control factor of main reservoir
PDF Full Text Request
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