Natural Gas Geoscience ›› 2019, Vol. 30 ›› Issue (9): 1312-1318.doi: 10.11764/j.issn.1672-1926.2019.02.002

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Source rock controlling effects on hydrocarbon migration and accumulation of Weizhou11⁃4 & Weizhou11⁃4N oil fields in Weixi′nan Sag, Beibuwan Basin

Shi-ju Liu1(),Gang Gao1(),Xin-de Xu2,Xiao-xiao Zhou1,Feng-yan Liu3,Jun Gan2,Gang Liang2   

  1. 1. State Key Laboratory of Oil and Gas Resources and Exploration/School of Earth Sciences, China University of Petroleum, Beijing 102249, China
    2. Zhanjiang Branch of CNOOC Ltd. , Zhanjiang 524057, China
    3. Exploration & Development Research Institute, PetroChina Huabei Oilfield Company, Renqiu 062552, China
  • Received:2018-11-29 Revised:2019-02-11 Online:2019-09-10 Published:2019-10-14
  • Contact: Gang Gao E-mail:979149011@qq.com.;gaogang2819@sina.com.

Abstract:

Based on the biomarker analysis, crude oil types are divided into type A and type B. Type A oil has a higher maturity and came from oil shale in the Second member of the Liushagang Formation, and type B oil has a lower maturity and derived mainly from mudstones in the upper part of the 2nd member and 1st member of the Liushagang Formation. Type A oil was distributed both in the Neogene Jiaowei Formation of the WZ11?4 oil field located in the high structural position of the sag margin and in the 3rd member of the Liushagang Formation of the WZ11?4N oil field in low structural position in sag. Type B oil was distributed mainly in the Weizhou and the 1st member of the Liushagang Formation of the WZ11?4N oil field. Spatial distribution relation of crude oil types and source rocks indicates that type A oil was accumulated chiefly in the 3rd member of the Liushagang Formation and high structural position in the margin of sag. Type B oil migrated vertically along faults and accumulated in the sag. This indicates that the crude oil coming from lower mature source rock accumulates mainly in sag, with a close migration distance, while type A oil accumulates chiefly in the reservoirs nearby the bottom oil shale layer of the 2nd member of the Liushagang Formation and in high structural positions in sag margin.

Key words: Weixi′nan Sag, Weizhou11?4 oil field, Weizhou 11?4N oil field, Petroleum migration and accumulation, Crude oil type

CLC Number: 

  • TE122.1

Fig.1

The location and basic tectonic element map of the Weixi′nan Sag"

Table 1

The biomarker parameters and carbon isotope composition of the crude oil in the Weizhou 11?4 and 11?4N oil fields in the study area"

油田 涠洲11?4 涠洲11?4N
WZ11?4?1 WZ11?7?2 WZ11?7?2 WZ11?7N?3 WZ11?7N?5
深度/m 989.50 2 646.00 2 063.60 2 190.20 2 410.00
层位 角二段 流三段 流一段 流一段 流一段
原油类型 A A B B B
全油δ13C/‰ -26.65 -25.20 -28.80 -29.26 -28.86
Pr/Ph 1.40 1.62 2.35 1.81 1.87
Ts/Tm 2.51 6.44 1.13 0.94 1.03
C21/C27甾烷 1.09 1.45 0.07 0.10 0.06
重排C27甾烷/ααα?20R?C27甾烷 2.59 2.80 0.71 0.68 0.62
ααα?20R?C27/C29甾烷 0.88 1.04 1.37 1.38 1.32
20S/(20S+20R)?C29甾烷 0.58 0.59 0.27 0.32 0.27
ββ/(ββ+αα)?C29甾烷 0.52 0.55 0.35 0.38 0.34
三环萜烷/五环萜烷 0.21 0.31 0.02 0.02 0.03
C21/C23?三环萜烷 1.02 1.01 0.94 0.97 0.89
C24 四环萜烷/C26三环萜烷 0.83 1.23 2.27 2.75 2.11
C29 Ts/C30?降藿烷 0.78 2.62 0.41 0.35 0.37
C30重排藿烷/C30降藿烷 0.54 2.54 0.13 0.09 0.01
C30?莫烷/C30藿烷 0.15 0.20 0.13 0.14 0.12
伽马蜡烷/C30藿烷 0.06 0.14 0.04 0.04 0.03

Table 2

The biomarker parameters and carbon isotope composition of some source rocks"

井号 层位 深度/m 1 2 3 4 5 6 7 8 9 10 11 12 13 14
WZ11?4N?C 流二段 2 807.0 1.41 4.21 1.10 1.67 1.11 0.53 0.55 0.24 1.10 1.44 1.24 0.58 0.22 0.05
WZ12?2?A 流三段 2 894.0 1.53 2.61 1.91 2.37 1.19 0.60 0.48 0.41 1.15 1.84 0.97 0.61 0.23 0.08
WZ11?8?A 流二段 3 152.0 2.01 3.59 1.29 2.47 2.02 0.59 0.55 0.32 1.28 2.19 1.71 1.42 0.53 0.09
WZ11?2?A 流二段 3 344.0 1.66 21.91 1.62 1.43 0.98 0.49 0.56 0.43 1.11 1.38 2.04 1.20 0.45 0.07
WZ11?2?A 流二段 3 242.0 1.80 5.66 0.89 2.66 1.29 0.47 0.55 0.19 0.76 1.38 0.95 0.72 0.25 0.07
WZ10?8?A 流二段 2 712.0 3.31 1.05 0.17 1.22 1.10 0.46 0.37 0.06 0.96 2.86 0.45 0.10 0.06 0.04
WZ11?2?A 流二段 3 326.0 1.36 9.88 1.09 2.50 1.68 0.50 0.58 0.32 0.97 1.32 1.99 2.08 0.63 0.12
WZ11?4N?F 流一段 2 203.3 2.30 0.54 0.06 0.68 0.35 0.22 0.22 0.03 1.08 4.06 0.30 0.04 0.03 0.03
WZ12?2?C 流二段 2 938.0 5.06 3.47 1.38 3.47 0.92 0.41 0.60 0.09 1.14 4.07 0.73 0.39 0.12 0.05
WZ6?3?A 流二段 2 204.5 0.77 0.61 0.68 1.17 0.43 0.16 0.23 0.13 1.25 1.93 0.40 0.07 0.02 0.06
WZ10?3W?D 流二段 1 997.0 1.84 0.30 0.16 1.34 0.47 0.06 0.25 0.03 1.75 4.43 0.43 0.10 0.03 0.07
WZ6?3?1B 流二段 2 705.5 1.45 0.53 0.07 0.32 0.12 0.32 0.25 0.05 0.80 1.92 0.26 0.04 0.04 0.03
WZ5?7?A 流二段 3 210.0 3.35 0.78 0.20 2.05 1.66 0.41 0.36 0.06 1.17 3.05 0.47 0.12 0.07 0.06
WZ11?4N?C 流一段 2 127.0 1.70 0.64 0.08 0.67 0.29 0.17 0.26 0.02 1.25 2.44 0.34 0.07 0.04 0.04
WZ10?7?A 流二段 2 184.0 1.63 0.62 0.09 0.61 0.19 0.10 0.21 0.03 1.54 2.31 0.41 0.06 0.03 0.02
WZ11?7?A 流一段 2 505.1 2.62 1.98 0.12 3.06 3.30 0.43 0.45 0.04 1.09 2.81 0.80 0.27 0.11 0.06

Fig.2

The mass chromatograms(TIC,m/z 191 and m/z 217) of the saturates fraction from the group A of crude oils in the study area"

Fig.6

The cross plot of Pr/nC17 versus Ph/nC18 of groups A and B crude oils"

Fig.3

The mass chromatograms (TIC,m/z 191 and m/z 217) of the saturates fraction from the group B of crude oils in the study area"

Fig.4

Contrast diagram for biaomarker parameters of groups A and B crude oils in the study area"

Fig.5

The ternary plot for 20R?ααα?C27,C28,C29 steranes of groups A and B crude oils"

Fig.7

Diagram of depth against 20S/(20S+20R)?C29 sterane and Ts/Tm of source rocks and crude oils in the oil fields of the Weizhou 11?4 and the Weizhou 11?4N in the study area"

Fig.8

The section of the hydrocarbon generation-accumu-lation and the tectonic evolution through the Weizhou 11?4 and Weizhou 11?4N structures in the C Subsag"

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