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Study on Sequence Stratigraphy of Damoguaihe Group in the Northwestern Beier Depression

Author: LiuWeiWei
Tutor: HuYuShuang;ZhuDeFeng
School: Northeast University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: Sequence stratigraphy Sequence stratigraphic framework Systems tracts Sedimentary facies Delta Lithologic traps
CLC: P539.2
Type: Master's thesis
Year: 2010
Downloads: 36
Quote: 1
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Abstract


The Bessie North region is the Beier Sag important oil and gas exploration area. In this paper, the sequence stratigraphy, sedimentology theory as a guide, seismic, logging, mud logging, core data, Bessie North grinding Shui River Formation sequence stratigraphic framework, depositional systems detailed research. The Bessie North Damoguaihe strata a complete super sequence can be divided LST transgressive systems tract and highstand systems tracts early late highstand systems domain period and HST, 5 period 5 during the internal division of 12 four-layer sequence. LST a four layer sequence (D Ⅰ 1 layer sequence), two four layer sequence (D Ⅰ 2 and D Ⅰ 3 layer sequence) transgressive systems tract and highstand systems domain early two four layer sequence ( D Ⅰ 4 and D Ⅰ 5 layer sequence), highstand systems domain phase four fourth-sequence (D Ⅱ 1 to D Ⅱ 4 layer sequence), high-water system domain late three four layer sequence (D Ⅱ 5 to D Ⅱ 7 layer sequence). Damoguaihe group identified a total of four kinds of phase, 15 kinds subfacies, 26 microfacies. Lowstand systems domain during the water shallow growth faults at the main developmental fan triangular phase, the northern part of the main development braided river delta phase; water intake during the deposition of the water body dramatically changed deep, eastern, western and northern part of the main development braided river delta phase; high water level early during the deposition of water is more stable western slopes still developmental braided river delta and northern part of the development of song stream river delta; high water level in the mid-deposition during the water shallow, only the northern part of the development of song stream river delta; late high water level during the deposition of the water body further shallowing , the mesh River Delta of northern development. Daruma Shui River Formation sand bodies by phase with control obvious sequence stratigraphy predict lithologic traps powerful weapons. Combined stratigraphic sequence evolution, the four sequence advantage sedimentary microfacies the plane distribution characteristics and sandstone thickness characteristics Damoguaihe group predicted a total fan delta front sandstone updip pinch out trap delta sandstone updip pinch out trap, Delta outward continuation of the four categories of lithologic traps with sandstone lenticular trap in turbidite rock trap. Reservoir-cap features grinding Shui River Formation is divided into three sets of reservoir-seal assemblage, three predicted favorable zones in the first set of reservoir-cap portfolio, two favorable areas predicted second reservoir and cap combination with third reservoir cap combination predicted two favorable zones.

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CLC: > Astronomy,Earth Sciences > Geology > Historical geology, stratigraphy > Various types of stratigraphy > Sequence stratigraphy
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