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Upper Paleozoic Sedimentary Facies Research In The Pilot Test Area Of Yanchang Gas Field

Posted on:2012-05-07Degree:MasterType:Thesis
Country:ChinaCandidate:C M LiuFull Text:PDF
GTID:2180330332489183Subject:Paleontology and stratigraphy
Abstract/Summary:PDF Full Text Request
Study area in the southeastern part of the Ordos Basin, is a compact low-permeability gas field, reservoir development, and good conditions for gas accumulation.Thesis is based on geological background and information on basin evolution,Producted Log-phase template、Divided a single well Phase、established Sedimentary facies profile through the core data, identification data and well log characteristics. Take the main sand distribution to analyze Sedimentary facies and space - time evolution in the study area to provide geological basis for Stratigraphic trap and favorable area prediction.Made the following key understanding:1.Identify and select key marker bed; the first Contrast large section, and then Contrast subparagraph, The sedimentary cycle、accommodate space conversion surface, lithology and facies changed surface to determine boundary layers. Reference to the thickness of adjacent wells, horizontal track and contrast to the region "closed". Stratigraphic division and correlation results showed that Stratum thickness is relatively stable in shanxi and Stone box. Stratum thickness changed greatly in Benxi, Taiyuan. Thick stratigraphic thickness is thick in the eastern and thin in the western in benxi.north is the deposited central in y128 well regional. Southern is the deposited central in yq2 well regional.The south-east region is important deposition zone.2.According to lithology, different phase (sub-phase, micro-phase) logging response characteristics and analysis test data, the study area are identified as a barrier coast sedimentary environment in Benxi, the study area mainly developed barrier island, lagoon subfacies, barrier bar and lagoons mud microfacies. the mainly developed fluvial-dominated delta deposits in shanxi and h8. the study area mainly developed delta front, distributary channel, mouth bar, distal bar, crevasse splay and interdistributory bay microfacies.3. sea water to exit the area after Benxi and Taiyuan deposition. Lagoon, barrier, tidal flat sedimentary facies formed in late Carboniferous Benxi and continental shelf, tidal flat and delta facies formed in early Permian Taiyuan frequent rapid marine transgression and slowly regression. And has begun to develop continental facies lake - fluvial-dominated delta sedimentary facies since Early Permian Shanxi.4. Dark mud stone, coal and bio-limestone is source rocks in Benxi, Taiyuan and Shanxi Group, barrier bar, coastal alluvial plain braided channel, main channel of underwater distributary channel, crevasse splay, mouth bar etc. as reservoirs, Overlying dark mud stone in interdistributory bay as the caprock,form their own generation and own storage combination. In xiashihezi natural gas pool is lower generation and upper storage combination, The underlying layer of coal as a source rocks. underwater distributary channel, crevasse splay, mouth bar as reservoirs; Overlying mud stone as the caprock.
Keywords/Search Tags:Ordos, Benxi, Shanxi, stone boxes, sedimentary facies, barrier coast, Delta
PDF Full Text Request
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