We investigated the petrological and seismic properties of Madingo Formation, the highquality source rocks in the Madingo Formation in the Lower Congo Basin are highly heterogeneous. Due to little drilling and oil-bas...We investigated the petrological and seismic properties of Madingo Formation, the highquality source rocks in the Madingo Formation in the Lower Congo Basin are highly heterogeneous. Due to little drilling and oil-based mud pollution, samples that are able to be used to measure the TOC(total organic carbon) content of source rock in the Madingo Formation are few and unevenly distributed;hence, it is difficult to carry out their quantitative evaluation. We investigated the petrological and seismic properties of Madingo Formation between TOC and well logging parameters including density, natural gamma, and acoustic time difference via multiple regression analysis. The TOC data volume is calculated using a neural network model between the predicted TOC content and seismic attributes of the sidetrack. The results of TOC three-dimensional quantitative prediction in the study area show that the source rocks in the Madingo Formation have a strong heterogeneity in the vertical direction, and the plane distribution is low in the northeast and high in the southwest. This study provides suitable tools to predict the complex heterogeneous distribution of source rocks and has great significance for oil exploration in the Lower Congo Basin.展开更多
The turbidite is favorable for accumulation of oil and gas and it is the most important reservoir in the deepwater area of West Africa.Currently,some commercial discoveries in such the deepwater area generally belong ...The turbidite is favorable for accumulation of oil and gas and it is the most important reservoir in the deepwater area of West Africa.Currently,some commercial discoveries in such the deepwater area generally belong to turbidite sandstone reservoirs.Based on comprehensive analysis of lithology,lithofacies and configuration of the turbidite,and combined with changes of seismic attributes and sedimentary cycle,the turbidite in the deepwater area of West Africa can be classified into by-pass channel(including the constructive by-pass channel and the erosive by-pass channel),confined channel complex,weakly confined channel complex,and lobe.Different types of turbidite reservoirs have different physical property,so there are differences in hydrocarbon exploration potential;the sandstone in the weakly confined channel complex is the key exploration target in the deepwater area of the Angola Sea.展开更多
下刚果—刚果扇盆地为深水浊积岩油气勘探成功的典型含油气盆地。盆内广泛发育的浊积水道为重要储层类型,蕴含丰富的油气资源。前人从构造和沉积等角度对深水水道沉积模式及控制因素进行了大量研究,取得了长足进展(Henry et al.,2019;...下刚果—刚果扇盆地为深水浊积岩油气勘探成功的典型含油气盆地。盆内广泛发育的浊积水道为重要储层类型,蕴含丰富的油气资源。前人从构造和沉积等角度对深水水道沉积模式及控制因素进行了大量研究,取得了长足进展(Henry et al.,2019;陈华等,2021)。然而也有大量实钻资料表明水道体系内部砂体期次的沉积发育和叠置关系非常复杂,储层非均质性很强(张文彪等,2017)。展开更多
基金supported by the China National Offshore Oil Corporation Research Institute of Program (No. CRI2015FW001)China National Research and Development Project (No. 2017ZX05032)+1 种基金Major National Science and Technology Programs in the “Thirteenth Five-Year” plan period (No. 2016ZX05048)Study on identification and prediction technology of source rocks in key area of west Africa-South America sea national oil and gas projects in the “Thirteenth Five-Year” plan period (No. 2017ZX05032-001-002)。
文摘We investigated the petrological and seismic properties of Madingo Formation, the highquality source rocks in the Madingo Formation in the Lower Congo Basin are highly heterogeneous. Due to little drilling and oil-based mud pollution, samples that are able to be used to measure the TOC(total organic carbon) content of source rock in the Madingo Formation are few and unevenly distributed;hence, it is difficult to carry out their quantitative evaluation. We investigated the petrological and seismic properties of Madingo Formation between TOC and well logging parameters including density, natural gamma, and acoustic time difference via multiple regression analysis. The TOC data volume is calculated using a neural network model between the predicted TOC content and seismic attributes of the sidetrack. The results of TOC three-dimensional quantitative prediction in the study area show that the source rocks in the Madingo Formation have a strong heterogeneity in the vertical direction, and the plane distribution is low in the northeast and high in the southwest. This study provides suitable tools to predict the complex heterogeneous distribution of source rocks and has great significance for oil exploration in the Lower Congo Basin.
基金The work was supported by Project of SINOPEC Science and Technology Department(P12053).
文摘The turbidite is favorable for accumulation of oil and gas and it is the most important reservoir in the deepwater area of West Africa.Currently,some commercial discoveries in such the deepwater area generally belong to turbidite sandstone reservoirs.Based on comprehensive analysis of lithology,lithofacies and configuration of the turbidite,and combined with changes of seismic attributes and sedimentary cycle,the turbidite in the deepwater area of West Africa can be classified into by-pass channel(including the constructive by-pass channel and the erosive by-pass channel),confined channel complex,weakly confined channel complex,and lobe.Different types of turbidite reservoirs have different physical property,so there are differences in hydrocarbon exploration potential;the sandstone in the weakly confined channel complex is the key exploration target in the deepwater area of the Angola Sea.
文摘下刚果—刚果扇盆地为深水浊积岩油气勘探成功的典型含油气盆地。盆内广泛发育的浊积水道为重要储层类型,蕴含丰富的油气资源。前人从构造和沉积等角度对深水水道沉积模式及控制因素进行了大量研究,取得了长足进展(Henry et al.,2019;陈华等,2021)。然而也有大量实钻资料表明水道体系内部砂体期次的沉积发育和叠置关系非常复杂,储层非均质性很强(张文彪等,2017)。
