Oil & Gas Geology ›› 2020, Vol. 41 ›› Issue (6): 1119-1128.doi: 10.11743/ogg20200601
• Petroleum Geology • Previous Articles Next Articles
Bojiang Fan1(), Qiliang Mei2, Xiaojun Wang2, Yue Meng2, Qijiang Huang2
Received:
2019-06-12
Online:
2020-12-28
Published:
2020-12-09
CLC Number:
Bojiang Fan, Qiliang Mei, Xiaojun Wang, Yue Meng, Qijiang Huang. Geochemical comparison of mudstone and shale—A case study of the 7th member of Yanchang Formation in Ansai area, Ordos Basin[J]. Oil & Gas Geology, 2020, 41(6): 1119-1128.
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Table 1
Basic geochemical characteristics of mudstone and shale source rocks from Ansai area, Ordos Basin"
参数 | TOC/% | (S1+S2)/ (mg·g-1) | 氯仿沥青“A”含量/% | 总烃含量/10-6 | Ro/% | 有机质类型 | |
泥岩 | 数值范围 | 0.88~9.86 | 2.2~21.72 | 0.05~1.04 | 129.52~7282.20 | 0.72~1.10 | Ⅱ1与Ⅱ2型为主 |
平均数值 | 2.81 | 7.60 | 0.53 | 3569.44 | 0.87 | ||
样品数/个 | 19 | 30 | 30 | 30 | 14 | ||
评价 | 好 | 好 | 好 | 好 | |||
页岩 | 数值范围 | 0.86~10.81 | 3.00~32.41 | 0.33~1.48 | 253.95~8916.37 | 0.73~1.12 | Ⅰ型与Ⅱ1型为主 |
平均数值 | 3.57 | 11.21 | 0.51 | 3208.80 | 0.94 | ||
样品数/个 | 40 | 40 | 40 | 40 | 35 | ||
评价 | 好 | 好 | 好 | 好 |
Table 2
Comparison of typical biomarkers of mudstone and shale samples from Ansai area, Ordos Basin"
生标参数 | 泥岩(样品数17个) | 页岩(样品数33个) | |||
数值范围 | 平均值 | 数值范围 | 平均值 | ||
伽马蜡烷/C30藿烷 | 0.07~0.39 | 0.20 | 0.06~0.42 | 0.24 | |
CPI(碳优势指数) | 1.05~1.11 | 1.08 | 1.05~1.11 | 1.05 | |
OEP(奇偶优势指数) | 0.99~1.07 | 1.02 | 0.98~1.07 | 0.99 | |
Ts/(Ts+Tm) | 0.39~0.89 | 0.72 | 0.08~0.90 | 0.60 | |
C30重排藿烷/C29Ts | 0.58~4.85 | 2.31 | 0.60~6.87 | 2.05 | |
C31升藿烷22S/ (22S+22R) | 0.41~0.59 | 0.50 | 0.30~0.59 | 0.49 | |
C32升霍烷22S/ (22S+22R) | 0.52~0.58 | 0.56 | 0.45~0.60 | 0.53 | |
孕甾烷/升孕甾烷 | 0.00~5.72 | 2.54 | 0~20.32 | 3.46 | |
(孕甾烷+升孕甾烷)/ ααα20RC29甾烷 | 0.08~3.40 | 1.68 | 0.07~4.41 | 1.47 | |
C29甾烷ββ/(αα+ββ) | 0.27~0.50 | 0.42 | 0.24~0.52 | 0.38 | |
αααC29甾烷S/(S+R) | 0.39~0.62 | 0.53 | 0.30~0.73 | 0.48 | |
8β(H)-补身烷/ 8β(H)-升补身烷 | 0.79~1.61 | 1.23 | 0.79~3.17 | 1.51 | |
Pr/Ph | 1.22~2.17 | 1.64 | 1.22~2.17 | 1.65 | |
C27/C29规则甾烷 | 0.40~0.78 | 0.56 | 0.39~1.24 | 0.65 | |
Pr/nC17 | 0.16~0.62 | 0.3 | 0.16~0.62 | 0.27 | |
Ph/nC18 | 0.09~0.25 | 0.14 | 0.09~0.25 | 0.14 | |
C27/(C27+C28+C29)规则甾烷 | 0.20~0.28 | 0.24 | 0.19~0.40 | 0.27 | |
C28/(C27+C28+C29)规则甾烷 | 0.26~0.37 | 0.33 | 0.17~0.40 | 0.30 | |
C29/(C27+C28+C29)规则甾烷 | 0.36~0.52 | 0.43 | 0.35~0.54 | 0.43 |
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