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IMECH-IR  > 流固耦合系统力学重点实验室(2012-)  > 期刊论文
Title:
Statistical analysis as a tool for assisting geochemical interpretation of the Upper Triassic Yanchang Formation Ordos Basin Central China
Author: Pan SQ1,2,3; Horsfield B2; Zou CN3; Yang Z3; Gao DP(高大鹏)4
Source: INTERNATIONAL JOURNAL OF COAL GEOLOGY
Issued Date: 2017-03-01
Volume: 173, Pages:51-64
Abstract: The Yanchang Formation in the Ordos Basin is the most important petroleum play not only for conventional oil and gas accumulations but also for newly emerging shale oil and tight gas resources. The molecular characterization of the basinwide source rocks predicts three groups of generative petroleum types: Paraffinic High Wax Oil mixed base (Paraffinic-Naphthenic-Aromatic) Low Wax Oil and Gas and Condensate. Supplementary to previous work 68 samples including the crude oils source bitumens and reservoir extracts from the Yanchang petroleum play are analyzed. The distribution of two terpane classes (eight tricyclic terpanes and eight pentacyclic terpanes) are determined with subsequent simultaneous RQ-mode factor analysis for a composite data set of these samples alongside 216 published crude oils worldwide with known facies descriptions. Thermal maturity has been evaluated as a consistent distribution at first using a combined method of a maturity-related biomarker [Ts / (Ts + Tm)] and aromatic parameters (Methyldibenzothiophene Ratios) to alleviate the maturity differences effect when discussing geochemical characterization. The R-mode factor analysis consists of the first two factors that are describing 45 present of the cumulative total variance in the data set and presents a sample grouping pattern in Q-mode factor analysis which is determined by different contributions of terpane associations i.e. the tricyclic C-21 coupled with pentacyclic C-25 C-27 C-28 and Cm in the same factor space. Three terpane associations the C-28 and C-28 terpanes the C-21 and C-30 terpanes and the C-27 pentacyclic terpenes are respectively responsible for discriminating crude oil reservoir extracts and source bitumens in RQ-mode factor analysis. Molecular compositions further address more detailed interrelationships among three sample groups that crude oils and reservoir extracts are sharing close genetic relationships both in depositional environment typing and C-27-C-28-C-29 sterane distribution. Samples from source rocks vary much significantly. A mixing process which occurs after oils has been expelled from host source rocks into carrier units during accumulation. In addition the migration -contamination of C29 sterols when oils are cross through the Chang 7-2 unit along migration pathways might also explain this lack of correlation between source rocks and oil -reservoir system. (C) 2017 Elsevier B.V. All rights reserved.
Keyword: Upper Triassic Yanchang Formation ; Ordos Basin ; Geochemistry ; Molecular composition ; Biomarker ; Simultaneous R- and Q-mode factor analysis
Language: 英语
Indexed Type: SCI ; EI
DOI: 10.1016/j.coal.2017.02.009
DOC Type: Article
WOS Subject: Energy & Fuels ; Geosciences, Multidisciplinary
WOS Subject Extended: Energy & Fuels ; Geology
WOS Keyword Plus: POLYCYCLIC AROMATIC-HYDROCARBONS ; PALEOZOIC MARINE PETROLEUM ; OIL-SOURCE CORRELATION ; SWEET AREA EVALUATION ; MULTIPLE SOURCE ROCKS ; NORTH-CENTRAL CHINA ; TYPICAL CRUDE OILS ; IN-SOURCE ROCKS ; GAS ACCUMULATION ; TARIM BASIN
WOS ID: WOS:000403120400005
ISSN: 0166-5162
Funder: National Basic Research Program of China(2014CB239000) ; Chinese Major Scientific and Technological Program(2016ZX05406-006) ; China Scholarship Council (CSC)(201406010066)
Department: LMFS水环境流体力学(LEM)
First Institution (Yes or Not): False
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60605
Appears in Collections:流固耦合系统力学重点实验室(2012-)_期刊论文

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description.institution: 1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
2.GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany
3.Res Inst Petr Explorat & Dev PetroChina, Beijing 100083, Peoples R China
4.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China

Recommended Citation:
Pan SQ,Horsfield B,Zou CN,et al. Statistical analysis as a tool for assisting geochemical interpretation of the Upper Triassic Yanchang Formation Ordos Basin Central China[J]. INTERNATIONAL JOURNAL OF COAL GEOLOGY,2017-03-01,173:51-64.
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