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Effects of biodegradation on diamondoid distribution in crude oils from the bongor basin,Chad

Energy Geoscience 2024年第2期5卷 120-128页

作者： Huanxin Song Menghan Chen Lirong Dou Dingsheng Cheng Zhigang Wen Cooperative Innovation Center of Unconventional Oil and Gas Yangtze UniversityWuhanHubei430100China College of Resources and Environment Yangtze UniversityWuhanHubei430100China PetroChina Research Institute of Petroleum Exploration&Development Beijing100083China

The sensitivity of biodegradation on diamondoids was investigated using a series of biodegraded oil samples from the Ronier tectonic unit of bongor basin,*** results suggest that diamondoids,including adamantanes(As)and diamantanes(Ds),are relatively resistant to biodegradation and obvious biodegradation was observed in oils with a Peters-Moldowan(PM)biodegradation rank of 6 or ***,the sensibility of biodegradation on diamondoids is generally similar to hopanes and regular *** biodegradation evolves,the changes in concentration and components of diamondoids show that the biodegradation process is selective and *** significant increase of MD/MA and DMD/DMA for oils with a PM ranking 6^(+) indicates that diamantanes are generally more resistant to biodegradation than *** similar trends of DMA/MA,EA/MA,MD/D,DMD/MD and other relevant indexes,show that higher alkylation homologs are more resistant to *** commonly used diamondoid ratios,such as MAI,EAI,MDI and DMID-1,are obviously affected by biodegradation at the stage of high-level biodegradation,which may indicate that these ratios should be used with caution in case of severely degraded oils.

关键词： Diamondoids Biodegradation Sensitivity Crude oil bongor basin Chad

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Paleostress Reconstruction from 3D Seismic Data and Slip Tendency in the Northern Slope Area of the bongor basin, Southwestern Chad

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Open Journal of Geology 2023年第5期13卷 536-578页

作者： Hakro Ahmed Suhail Xintao Yuan Jianlin Li Hong Liu Yuan Liu Cong Ma Geophysical Research Institute BGP/CNPC Hebei China CNPC International (Chad) Co. Ltd. N’Djamena Chad Research Institute of Petroleum Exploration and Development Beijing China

Paleostress plays a significant role in controlling the formation, accumulation, and distribution of reservoirs, and this could be an important factor in controlling the production of hydrocarbons from the unconventional reservoirs. In this study, we will use 3D seismic reflection data to perform the slip-tendency-based stress inversion to determine the stress field in the basement of the northern slope area in the bongor basin. The dataset for this technique is easily available in the oil and gas companies. The stress inversion results from the basement of the northern slope area of bongor basin show that the maximum principal stress axis (σ1) is oriented vertically, the intermediate principal stress axis (σ2) is oriented N18° and the minimum principal stress axis (σ3) is oriented N105°, and σ2/σ1 = 0.60 and σ3/σ1 = 0.29. The findings of this paper provide significant information to understand the fault reactivation at the critical stage of hydrocarbon accumulation and the regional tectonic evolution.

关键词： Seismic Reflection Data Slip Tendency bongor basin Stress Inversion

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