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Study on the Sedimentary Facies of the Member 6 and 8 of Triassic Yanchang Formation in Huachi Area

Author: DuKai
Tutor: LiWenHou
School: Northwestern University
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Ordos Basin Huachi region Yanchang Sedimentary microfacies Underwater distributary channel sand body Turbidite rock mass
CLC: P618.13
Type: Master's thesis
Year: 2011
Downloads: 152
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Abstract


The Huachi areas in the Ordos Basin, the largest tectonic units - in northern Shaanxi slope southwest, its main oil-bearing horizons conventional Triassic Yanchang. Accompanied by growing exploration pace to accelerate and the deepening of the degree of exploration Huachi Chang 6 and Chang 8 exploration prospects gratifying. This paper, sedimentary petrology, basin tectonic dynamics, and other related disciplines based use diverse test analysis means, to extend the area of ??Triassic Chang 6 and Chang 8 two purpose reservoir group the sedimentary facies comprehensive analysis. Understand Triassic Yanchang Formation in Ordos Basin division plan, taking into account the actual production of the oil field units and the purpose of this paper creations, relying on a a region wide range stable distribution marker bed, effective and full use of logging data, according to the thickness of the original method and depositional cycles of the Chang 6 and Chang 8 two purposes reservoir group launched a fine stratigraphic classification and correlation, from top to bottom into long 61, long 621 long 622 long 623 long 631 length 632, length 633, length 81, length 82 9 reservoir segment, has laid a good foundation for further study. Comprehensive statistical comparison method, the use of light and heavy mineral paleocurrent measurement analysis and comparison of two target layer provenance REE distribution system analysis to identify 6 of Yanchang deposition NE and SW direction of two provenance of the direction in which the north east to the main source, and Nancy to the secondary source; Chang 8 deposition, in addition to the two provenance northwest provenance, presumably from the west of the Helan Mountains Alashan ancient land. According to the division of the sedimentary facies identification mark, to determine the Chang 6 and Chang 8 meandering river delta, braided river delta phase three types of sedimentary facies and lacustrine; meandering river delta front subfacies prodelta subfacies braided river delta front, braided river delta subfacies, shallow lake subfacies, deep lake equal subfacies type in these sub-phase development of the variety of sedimentary microfacies; Chang 8 is not developed deep lake subfacies. Chang 6 and Chang 8 reservoir group decided in sedimentary facies characteristics and development the different microfacies under the sand body morphology and size of the sand body distribution. Chang 8 sand body underwater distributary channel sand body, the sand body in addition to the 6 of Yanchang underwater distributary channel sand in vitro, there are a certain number of turbidite rock sand body. Underwater distributary channel sand body often isolated strip-shaped distribution of turbidite rock was flower-shaped or fan-shaped distribution. Purpose reservoir group system analysis of the sedimentary environment conducive to help provide a theoretical area follow-up of oil and gas exploration and development work.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
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