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1.
Sedimentary heterogeneities are ubiquitous in nature and occur over a range of scales from core, reservoir to basin scales. They may thus exert significant influences on hydrocarbon generation, migration and accumulation. The sedimentary heterogeneities of the Permian Shanxi Formation in the Ordos Basin, China were modelled using Sedsim, a stratigraphic forward modelling program. The simulation results were then used to construct a 3D petroleum system model using PetroMod. The effects of sedimentary heterogeneities on hydrocarbon accumulations were evaluated by comparing the integrated Sedsim-PetroMod model with the classic 3D basin model. The Sedsim simulation shows that considerable sedimentary heterogeneities are present within the Shanxi Formation, as a result of the interplay of the initial topography, tectonic subsidence, base level change and sediment inputs. A variety of lithologies were developed both laterally and vertically within the Shanxi Formation at kilometre and metre scales, respectively, with mudstones mainly developed in the depositional centre, while sandstones developed in the southern and northern margin areas. A typical source-ward retrogradation is well developed within the Lower Shanxi Formation.A base-case classic 3D basin model was constructed to quantify the Permian petroleum system in the Ordos Basin. The geological and thermal models were calibrated using Vr and borehole temperature data. The source rocks of the Upper Paleozoic became mature (Ro > 0.5%) and high mature (Ro > 1.2%) in the late Triassic and late Jurassic, respectively, in the central and southern areas. During the Early Cretaceous, a tectonically induced geothermal event occurred in the southern Ordos Basin. This caused the source rocks to reach over maturity (Ro > 2.0%) quite rapidly in the early Late Cretaceous in the central and southern areas. All the source rock transformation ratios (TR) at present are greater than 70% in the P1 coal and P1 mudstone layers with TR values approaching 100% in the central and southern areas. The transformation ratios of the P1 limestone are close to 100% over the entire interval.In the base-case model, a large amount of hydrocarbons appear to have been expelled and migrated into the Shanxi Formation, but only a minor amount was accumulated to form reservoirs. In the model, the Shanxi Formation sandstone layer was set to be homogeneous vertically and there was no regional seal rocks present at the top of the Shanxi Formation. Therefore hydrocarbons could not be trapped effectively with only minor accumulations in some local structural highs where hydrocarbons are trapped both at the top and in the up-dip direction by the adjacent mudstone facies. In contrast, the integrated Sedsim-PetroMod model takes into account of the internal lithological and sedimentary facies heterogeneities within the Shanxi Formation, forming complex contiguous sandstone-mudstone stacking patterns. Hydrocarbons were found to have accumulated in multiple intervals of lithological traps within the Shanxi Formation. The results indicate that lithological distinctions, controlled by sedimentary heterogeneities in three dimensions can provide effective sealing in both the top and up-dip directions for hydrocarbon accumulations, with gas being mainly accumulated near the depocentre where lithological traps usually formed due to frequent oscillations of the lake level. 相似文献
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台西南盆地地质构造特征及油气远景 总被引：7，自引：3，他引：7
杜德莉 《海洋地质与第四纪地质》1991,11(3):21-33
本文从盆地的基本地质特征入手,分析了台西南盆地的地层、沉积、构造特征及油气条件,在进行盆地的定性分析的基础上,对盆地内的次级构造单元进行了类比,对盆地的含油气远景进行了评价,提出了该盆地的油气勘探方向。 相似文献
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中国海域及邻区主要含油气盆地与成藏地质条件 总被引：15，自引：4，他引：11
蔡乾忠 《海洋地质与第四纪地质》1998,18(4):1-10
中国海域及邻区分布有近５０个沉积盆地，其中大部分发育在大陆边缘，而主要含油气盆地则分布在大陆架部位。盆地的起源，发生，发展受控于大地构造不同时期的构造运动，形成诸如裂谷型断陷盆地，走滑盆地以及非典型前陆盆地等多类型沉积盆地。从区域广度阐述了盆地沉积的有利相带对油气成藏的重要性，尤其是陆架盆地的成藏地质条件所形成的富集油气藏包括已发现的一大批大中型油气田，更具有的开发前景。 相似文献
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Bin Min Liangshu Shu Huibin Yin Weijiang Xin Dirong Zhang 《Marine and Petroleum Geology》2007,24(10):579-590
Several subaqueous alluvial fans are developed along the footwall of the northern boundary fault zone—the Daxing fault of the Langgu sag, Bohai Bay Basin, North China. A distinct feature is the significant difference in hydrocarbon enrichment between neighboring wells drilled in the same sedimentary facies. This paper analyses the controlling factors for hydrocarbon accumulation of subaqueous alluvial fan in the Caiyu field, north of the Langgu sag. Based on reprocessed seismic data and using Jason inversion method, the contrast of cross-well correlation panel was established and a reservoir type model was build-up; reservoir heterogeneity was interpreted from inversion impedance data. The result shows six conglomeratic bodies in this fan, which are stacked vertically and laterally. The lithofacies is the key controlling factor for the hydrocarbon accumulation, and diagenesis and tectonic stresses also play important roles in the hydrocarbon enrichment. 相似文献
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Yongcai Yang Xiaojun Xie Youchuan Li Gang Guo Xiaoying Xi Wenjing Ding 《海洋学报(英文版)》2023,42(3):254-269
The Xihu Depression in the East China Sea Shelf Basin is a large petroliferous sedimentary depression, in which oil and gas reservoirs were mainly discovered in the Pinghu Slope and the central inversion zone. The oil-gas source correlation in the Xihu Depression was analyzed by hydrocarbon generating thermal simulation data via gold-tube pyrolysis experiments. The results indicated that the oil and gas in the Xihu Depression were mainly derived from coal measure source rocks of the Eocene Pinghu Formation. Therefore, the identification of coal seams is extremely crucial for evaluating coal measure source rocks in the Pinghu Formation in the Xihu Depression. Geochemical and petrological characterization pointed to input of terrigenous organic matter and redox conditions of the depositional environment as factors that govern the ability of the coal measure source rocks in hydrocarbon generation in the Xihu Depression. In this regard, the sedimentary organic facies in the Pinghu Formation were classified into four predominantly terrigenous and one mixed-source subfacies, which all varied in carbon and hydrogen content. The coal measure source rocks in the carbon- and hydrogen-rich tidal flat-lagoon exhibited the highest hydrocarbon generation potential, whereas the mudstone in the neritic facies was the poorest in its hydrocarbon yield. These results suggested that the coal measure source rocks in the Pinghu Formation likely developed in the Hangzhou Slope and the Tiantai Slope, both representing promising sources for oil and gas exploration. 相似文献
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南华北盆地二叠系山西组页岩气成藏地质条件及勘探前景 总被引：2，自引：0，他引：2
对南华北盆地二叠系山西组暗色泥页岩发育的地质背景、有机地球化学参数以及钻井资料的分析研究表明,南华北盆地二叠系山西组暗色泥页岩在研究区内分布广泛,沉积厚度达30~100m,其中在太康、鹿邑地区的平均厚度超过60m;有机质丰度中等—高（1.76%~4.16%）,镜质体反射率适中,有机质处于成熟—过成熟阶段。研究区山西组地层发育微孔隙、微裂缝等孔隙类型,储集性能较好。等温吸附实验测得暗色泥页岩吸附气含量平均为1.32m3/t,表明山西组暗色泥页岩具有较强的吸附能力,吸附性较好。综合研究认为,南华北盆地二叠系山西组暗色泥页岩在荥阳—通许—太康—郸城一带分布厚度大,埋深适中,页岩气保存地质条件较好,具有良好的资源开发前景。 相似文献
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科尔占地区位于滨里海盆地阿斯特拉罕-阿克纠宾斯克隆起带东南部的比伊克扎尔次级隆起上，该地区广泛发育下二叠统孔谷组盐岩，以盐岩沉积为界，它将整个剖面划分为盐上层系（以碎屑岩为主的含油气层系）和盐下层系（以碳酸盐岩为主的含油气层系）两个大的含油气层系，石炭系为盐下层系中主要的含油气层系之一。通过对研究区唯一的盐下井K井岩屑及其薄片的详细观察，并结合该井测井资料，分析了石炭系的沉积特征，并对其沉积相进行了划分与描述。K井石炭系主要发育3种类型沉积相，分别为深水浊积扇相、斜坡相和台地相，其中深水浊积扇相可进一步划分为内扇、中扇和外扇3个亚相，台地相划分为滩间洼地和台内滩2个亚相。利用K井钻探结果，结合区域资料，初步预测出科尔占地区早石炭世和中石炭世末期沉积相带的平面分布特征。 相似文献
10.
Sunil Varma Jim Underschultz Tess Dance Robert Langford Joan Esterle Kevin Dodds Dominique van Gent 《Marine and Petroleum Geology》2009
Coal-fired power stations in Collie, Western Australia emit 10 million tonnes of CO2 per year. This study assesses the potential opportunities of geological storage of CO2 both within the Collie Basin and the onshore part of the adjacent Southern Perth Basin of Western Australia within 50 km of Collie town site through a desktop evaluation of existing data. The aquifers and coal formations within both basins have been evaluated for their suitability for storage based on geological, geographical and environmental criteria related to storage capacity, injectivity, proximity to sources of CO2, location of other natural resources and containment security. The study has concluded that there is limited scope for large-scale storage of CO2 within the Collie Basin. In addition the potential for storage within coals of either basin is not a viable solution. This assessment is based on published criteria for CO2 storage in sedimentary basins and coal-bearing formations. 相似文献