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The Research on Sedimentary System of Chang6-chang8, Yanchang Formation, Fuxian Area, Ordos Basin

Author: HuangDeCai
Tutor: ZhaoJunXing;HouMingCai
School: Chengdu University of Technology
Course: Geology
Keywords: Ordos Basin 6 - Chang 8 Depositional systems Sedimentary facies Paleogeographic
CLC: P512.2
Type: Master's thesis
Year: 2011
Downloads: 98
Quote: 0
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Abstract


Fuxian area is located in the south - east of the Ordos Basin , located in northern Shaanxi slope tectonic southeast edge of the zone . Chang 6 - long the the 8 reservoir group as thesis object . Papers by a large number of field and laboratory research , provenance direction , the deposition system and development mode , paleogeographic characteristics and evolution of a more systematic study . Basis for diagrams of Dickinson Triangle , paleocurrent data , the distribution of heavy minerals , lithic type distribution Fuxian Exploration Area Yanchang provenance , provenance mainly from the North East to be from the southwest part of the deposition of the southern region Ministry provenance . District outcrop , drilling core logging and sedimentary facies flag , the Chang - Chang 8 lake delta is divided into three types of sedimentary facies , lakes and lakes turbidite fan and further study of the major developmental characteristics of sedimentary facies . Delta depositional system developed delta front subfacies is the most developed and distributed in layers bit . Turbidites developed in the study area southwest Minister 6 - 8 during the long semi- deep lake - deep lake , and semi-deep lake - one of the deep lake and reservoir type . Fuxian area Yanchang paleogeographic characteristics and evolution of the preparation of the different periods of lithofacies palaeogeography maps . Existence the two lakes deltaic sediments style , a class for 8 - long long period retrograding delta sedimentary sequence, bottom-up constitutes a positive cycle . The lake basin area during the gradual expansion of the process of slow transgressive delta front and shallow lacustrine dividing line gradually migrated to the northeast , the delta front deposition gradually retreat , the southern semi- deep lake waters developmental turbidite fan deposition ; the other for a long period into the plot type delta 6 , sedimentary sequence, bottom-up constitutes a large anti cycles . The delta of the period to keep the SW direction forward , the six long in most parts of the study area has been converted for delta facies , shallow lacustrine deposits have retreated to the south of the study area . The genetic type of reservoir sand bodies delta front underwater distributary channel sand bodies , stacked underwater distributary channel sand bodies , estuarine the dam sand , underwater distributary channel and mouth bar combination of sand bodies and turbidite sand body and underwater distributary channel and turbidite sand body as the main .

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CLC: > Astronomy,Earth Sciences > Geology > Dynamic geology > External force > Denudation,handling the role of the deposition
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