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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (1): 47-60.doi: 10.11764/j.issn.1672-1926.2019.08.005

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The geochemical characteristics of Middle-Upper Ordovician source rocks in Keping outcrops profiles and marine oil-source correlation, Tarim Basin, NW China

An-lai MA1(),Hui-li LI1,Jie-hao LI2,Xiao-peng GAO1,Fan WANG3,Yao YAO1,Fan FENG1   

  1. 1.Petroleum Exploration & Production Research Institute, Sinopec, Beijing 100083, China
    2.China University of Geoscience (Beijing), Beijing 100083, China
    3.China University of Petroleum (Beijing), Beijing 102249, China
  • Received:2019-07-05 Revised:2019-08-17 Online:2020-01-10 Published:2020-01-09
  • Supported by:
    National Science Foundation of China(41772153);Sinopec Ministry of Science and Technology(P16069)

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Abstract:

The Middle-Upper Ordovician source rocks developed in six outcrop profiles in Keping area, Tarim Basin, NW China were analyzed using organic geochemical scanning method. Source rocks of Middle-Upper Ordovician Salgan Formation developed in Dawangou, Kamatikan and Tonggusibulong outcrop profiles, with most TOC value greater than 1.0%. Whereas source rocks of the Upper Ordovician Yingan Formation only developed in the Dawangou outcrop profile. Combined with the analysis results of Lower Cambrian Yuertusi Formation developed in Xiaoerbulake, Sugaitebulake and West Yuti outcrops profiles, the source rocks of Yuertusi Formation, Salgan Formation and Yingan Foramtion showed similar molecular geochemical characteristics, with lower Pr/Ph value, C23 greater than C21 tricyclic terpane, higher gamacerane and higher C28 steranes content. The similarity in molecular compounds of Cambrian to Ordovician source rocks in Keping area may be a result of the high maturity. In the relative content of C27-C29 steranes, the most marine oils with C28 sterane lower than 25% showed great difference with that of the source rocks of Cambrian to Ordovician source rocks in Keping area. In the fraction carbon isotopes, the source rocks of the Lower Cambrian Yuertusi Formation have lower carbon isotopes, compared with that of the Middle-Upper source rocks. Especially in kerogen carbon isotopes, Lower Cambrian Yuertusi Formation is 5‰ lower than that of Middle-Upper Ordocivian source rocks. Overall，the carbon isotopic fractionation of saturate, bitumen, aromatic fraction, non-hydrocarbon fraction, asphaltenes and kerogen is small in source rocks from Middle-Upper Ordovican Salgan and Yingan Formation in Keping area. The carbon isotopes of kerogen of source rocks can be used as a parameter for oil-source correlation excluding the TSR of the oil reservoirs.

Key words: Middle-Upper Ordovician, Salgan Formation, Yingan Formation, Molecular marker, Carbon isotope, Oil-source correlation, Keping area

CLC Number: 

  • TE122.1+13

Fig.1

The location of outcrops profiles of Middle-Upper Ordovician source rocks in Keping area, Tarim Basin"

Fig.2

The TOC and pyrolysis data of source rocks from Middle-Upper Ordovician Salgan Formation in Dawangou outcrop profile"

Fig.3

The TOC and pyrolysis data of source rocks from Middle-Upper Ordovician Salgan Formation in Kamatikan outcrop profile"

Table 1

The organic matter abundance of source rocks of Salgan Formation from Upper Ordovician in Keping area"

剖面厚度/m岩性样品数TOC/%Pg/%Tmax/℃IH/(mg/gTOC)
大湾沟14.6页岩、泥岩28（0.04~3.62)/1.83（0.02~6.72)/2.94（444~518)/460（1~181)/116
灰岩、泥灰岩13（0.01~1.20)/0.15（0.03~2.74)/0.33（384~515)/461（63~221)/118
喀马提坎15.6页岩、泥岩15（0.19~3.43)/1.40（0.08~2.28)/0.66（442~476)/454（16~62)/37
灰岩、泥灰岩5（0.01~0.48)/0.15（0.03~0.28)/0.10（439~469)/453（41~154)/91
通古斯布隆10.6页岩、泥岩11（0.69~2.85)/1.66（0.23~1.08)/0.64（438~445)/441（11~59)/39
灰岩10（0.01~0.05)/0.02（0.01~0.04)/0.02（449~475)/463（32~156)/81
阿恰西一沟7.5灰岩16（0.01~0.02)/0.02（0.00~0.03)/0.02（445~500)/465（0~322)/83

Fig.4

The TOC and pyrolysis data of source rocks from Upper Ordovician Yingan Formation in Dawangou outcrop profile"

Table 2

The organic matter abundance of source rocks of Yingan Formation from Upper Ordovician in Keping area"

剖面厚度/m岩性样品数TOC/%Pg/%Tmax/℃IH/(mg/gTOC)
大湾沟29页岩、泥岩16（0.44~1.29）/0.67（0.41~1.54）/1.02（443~455）/450（50~133）/93
灰岩、泥灰岩9（0.14~0.54）/0.31（0.03~0.91）/0.37（339~455）/438（10~100）/60

羊吉坎

(阿恰西二沟)

169页岩、泥岩13（0.07~0.34）/0.22（0.03~0.15）/0.09（465~500）/489（15~41）/28
灰岩、泥灰岩12（0.02~0.24）/0.12（0.01~0.10）/0.04（434~504）/479（8~56）/28
阿恰西五沟14.7页岩、泥岩19（0.14~0.38）/0.27（0.02~0.06）/0.04（480~544）/503（9~20）/13
灰岩3（0.05~0.09）/0.06（0.02~0.07）/0.05（489~513）/503（22~99）/66

Fig.5

The GC chromatograms, mass chromatograms of terpanes and steranes of saturates from Cambrian and Ordovician source rocks from Keping outcrops profiles"

Fig.6

The relationship between Pr/nC17 and Ph/nC18 ratios in Cambrian and Ordovician source rocks from outcrops profiles in Keping area"

Fig.7

The relationship between C21TT/C23TT and C24Te/C26TT ratios in Cambrian and Ordovician source rocks from outcrops profiles in Keping area"

Fig.8

The relationship between C21TT/C23TT and G/C30H ratios in Cambrian to Ordovician source rocks from outcrops profiles in Keping area"

Fig.9

The ternary plots showing the relative distribution of C27-C29 regular steranes in Cambrian to Ordovician source rocks from outcrops profiles in Keping area"

Fig.10

Plot of DBT/P versus Pr/Ph value in Cambrian to Ordovician source rocks from outcrops profiles in Keping area （plate according to Ref.[30]）"

Fig.11

The carbon isotopes distribution curves of bitumen A, saturated fraction, aromatic fraction, non-hydrocarbon fraction, asphaletenes fraction and kerogen in source rocks from different ages in Tarim Basin"

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