Hydrocarbon Accumulation Process and Exploration Potential in Linhe Depression, Hetao Basin

doi:10.19657/j.geoscience.1000-8527.2021.056

Abstract

Abstract:

The Hetao basin is a small-medium continental petroliferous basin in Midwest China. A million-ton oilfield was recently discovered in the Jilantai tectonic belt in the southwestern Linhe Depression. Due to the complex geological conditions and low degree of prospecting, the reservoir dynamic evolution is yet to be well understood. The reservoirs in the Jixi uplift belt and the central fault-barrier belt are taken as the main research target. Geological and seismic data were collected from comprehensive petroleum geological analysis, whilst dynamic analysis of the reservoir was performed by the “nine histories” analysis method. Three major findings are obtained: (1) the hydrocarbon accumulation timing was late and comprises three stages, i.e. the hydrocarbon generation, fault activity, and oil filling; (2) Quaternary strike-slip tectonism affected the oil accumulation. Negative flower-like structure was not developed, and the area with strong tectonic inversion in the late period is favorable for hydrocarbon accumulation. Meanwhile, the area with intense uplift and minor negative flowery structure is favorable for oil accumulation; (3) the southwest uplift belt and the central fault-barrier belt are selected as favorable exploration zone.

Key words: Linhe depression, Meso-Cenozoic, reservoir characteristics, hydrocarbon source rocks, late-stage accumulation

CLC Number:

TE122.1

SHEN Hua, LIU Zhen, SHI Yuanpeng, XU Zeyang, LI Yongjun, CHEN Shuguang, WANG Huilai, WANG Zhicheng, WANG Biao, LIU Chang. Hydrocarbon Accumulation Process and Exploration Potential in Linhe Depression, Hetao Basin[J]. Geoscience, 2021, 35(03): 871-882.

Figures/Tables 11

Fig.1 Structural unit division of Linhe depression in the Hetao basin

Fig.2 Typical oil reservoir profile in the Linhe Depression (location in Fig.1)

Fig.3 Thermal evolution simulation of main hydrocarbon source rocks in the Linhe depression

Fig.4 Activity analysis of typical oil-source faults in the Linhe depression

Fig.5 Analysis of typical well-burial and oil-filling history in the Linhe depression

Fig.6 "Nine-history" analysis diagram of the Lower Cretaceous Guyang Formation reservoir in the Jjihua2X well

Table 1 Comparison of major reservoir characteristics in the Linhe depression

Fig.7 Dark mudstone isopach map of Cretaceous and Paleogene source rock sequence in the Linhe depression

Fig.8 NE-SW-trending reservoir distribution pattern in the Linhe depression (location in Fig.1)

Fig.9 Relations between typical well oil production and denudation thickness

Fig.10 Prediction map of favorable exploration zones in the Linhe Depression

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