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Characteristics and differences of source rocks in the lower and upper members of Carboniferous Ha’erjiawu Formationin the Malang Sag of the Santanghu Basin,NW China

Li Yu-ting,Huang Zhi-long,An Cheng-long,Ma Qiang,Wang Rui,Xin Ming#br# #br#     

  1. 1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;2.PetroChina Tuha Oilfield Company,Hami 839009,China;3.PetroChina Qinghai Oilfield Company,Dunhuang 736202,China
  • Received:2017-05-19 Revised:2017-09-19 Online:2018-01-10 Published:2018-01-10

Abstract:

The Ha’erjiawu Formation in the Santanghu Basin can be divided into the lower and upper members which differ in the lithologies and forming environments of their source rocks,resulting in the greater differences in their geochemical characteristics of source rocks as well.In this paper,the Carboniferous Ha’erjiawu Formation source rock in the Malang Sag of the Santanghu Basin has been analyzed based on core and thin section observations.By single-well lithology identification,the longitudinal developmental features of source rocks have been clarified;geochemical characteristics of source rocks have been studied through TOC measurements,Rock-Eval analysis,carbon isotope of kerogen,RO measurements,and maturity parameters from biomarkers.Single-well TOC value was predicted by using the ΔLogR method and the differences in plane distribution were analyzed.It is indicated in the results that the Ha’erjiawu Formation source rocks mainly contain carbonaceous mudstone and tuffaceous mudstone,with the former mainly in the lower member and the latter in the upper member;the organic matter abundance of carbonaceous mudstone is higher than that of tuffaceous mudstone;for the Ha’erjiawu Formation source rocks,the middle-upper part contains higher TOCvalues than that in the bottom.For the plane distribution of TOC values in the upper and lower members of the Ha’erjiawu Formation,it developed several high value centers which are in agreement with depositional centers.Due to the migration of depositional centers in the upper and lower members,plane distribution of TOC values in the lower and upper members of the Ha’erjiawu Formation is quite different;the source rock mainly contains Type Ⅰ and Type Ⅱ organic matter,and the upper member is slightly better than the latter for organic matter type.

Key words: Tuffaceous mudstone, Carbonaceous mudstone, Geochemistry characteristics, Source rock, Ha’erjiawu Formation, Malang Sag

CLC Number: 

  • TE122.2

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