鄂尔多斯盆地富县地区延长组长7烃源岩特征及评价

doi:10.12108/yxyqc.20200107

Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 66-75.doi: 10.12108/yxyqc.20200107

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Characteristics and evaluation of Chang 7 source rock of Yanchang Formation in Fuxian area, Ordos Basin

HUANG Yanjie¹, BAI Yubin^1,2, SUN Binghua³, HUANG Li¹, HUANG Changwu⁴

1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an 710065, China;
3. Fuxian Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan'an 716000, Shaanxi, China;
4. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China

Received:2019-04-08 Revised:2019-07-13 Online:2020-01-21 Published:2019-11-22

Abstract

Abstract: In order to study the characteristics and hydrocarbon generation potential of Chang 7 source rock of Yanchang Formation in Fuxian area of Ordos Basin,core analysis,well logging research, kerogen microscopy, vitrinite reflectance(R_o) test,rock pyrolysis analysis, gas phase chromatography and chromatography-mass spectrometry were carried out. The results show that:(1) The average thickness of Chang 7 source rock in Fuxian area was 45 m,the TOC mass fraction averaged 5.94%,and the average hydrocarbon generation potential(S₁+S₂) was 13.1 mg/g.(2)The types of organic matter were mainly type I and Ⅱ₁,and the source of the source rock was mainly composed of lower aquatic organisms and contained some higher plants. The water body was a reducing environment during sedimentation.(3)The vitrinite reflectance averaged 0.76%. Among the biomarker compounds, C₃₁ hopane 22S(/22R+22S),20RC₂₉αββ(/αββ+ααα)and αααC₂₉20S(/20S+20R), the average values were 0.52,0.62,0.49,respectively,reflecting the evolution of organic matter into the peak stage of oil production.(4)On the plane, Chang 7 source rocks in the central and northwestern Fuxian area have large thicknesses and stronger hydrocarbon generation capacity, which is a favorable zone for further exploration. The research results play an important guiding role for fine exploration in Fuxian area of the Ordos Basin.

Key words: source rock, geochemical characteristics, Chang 7, Fuxian area, Ordos Basin

CLC Number:

TE132.2

HUANG Yanjie, BAI Yubin, SUN Binghua, HUANG Li, HUANG Changwu. Characteristics and evaluation of Chang 7 source rock of Yanchang Formation in Fuxian area, Ordos Basin[J].Lithologic Reservoirs, 2020, 32(1): 66-75.

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