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首页> 外文期刊>Journal of China University of Mining and Technology >Depositional Characteristics of Deltas and Their Relationship with Hydrocarbon Accumulation in the North Slope, Biyang Depression
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Depositional Characteristics of Deltas and Their Relationship with Hydrocarbon Accumulation in the North Slope, Biyang Depression

机译：泌阳pression陷北坡三角洲沉积特征及其与油气成藏的关系

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摘要

Tectonic movements in the North Slope of Biyang Depression are comparatively mild and stable, thus generating two categories of deltas. Elementary reasons for the coexistence of deltas are the existence of the palaeodrainage pattern and the effect of palaeotopography. The sedimentary facies is the most elementary factor controlling the physical property of reservoirs. The layout and spatial combination model of the sand body and faults are the major influential factors on the occurrence of hydrocarbons. Comparative study on Houzhang and Yanglou Braided Deltas as well as Zhangchang and Gucheng Meandering Deltas suggests that the hydrocarbons distribute primarily in the mouth bar subfacies and secondarily in the distal bar subfacies of the braided delta, while the oil-water and aqueous layers are mainly found in the subaquatic distributary channel. Although the sand body of the meandering delta has excellent stratification and high porosity, the thickness is far less than that of the braided delta. Therefore, the yield of hydrocarbon is relatively low. The mudstone of the delta front subfacies is a kind of source rock with a high content of organic matter. The conducting system for oil/gas migration in the North Slope is a composite one comprising faults and sandstone reservoirs. A large amount of oil/gas from the deep depression first migrated towards the slope along the sand body which stretches and connects with the source rocks, and then redistributed along the faults in the slope. After the movement reached a standstill, the faults formed the occlusion in the up-dip direction of the sand body, generating a great quantity of fault block hydrocarbon reservoirs in the North Slope.
机译：泌阳pression陷北坡的构造运动相对温和稳定，因此产生了两类三角洲。三角洲共存的根本原因是古排水模式的存在和古地形的影响。沉积相是控制储层物性的最基本因素。砂体和断层的布局和空间组合模型是影响油气成藏的主要因素。对后张和杨楼辫状三角洲以及张场和古城曲折三角洲的比较研究表明，碳氢化合物主要分布在辫状三角洲的嘴巴亚相中，其次分布在辫状三角洲的末梢巴亚相中，而油水和水层则主要存在在水底分配渠道中。尽管曲折三角洲的砂体具有出色的分层和高孔隙率，但其厚度远小于辫状三角洲的厚度。因此，烃的产率相对较低。三角洲前缘相的泥岩是一种有机质含量较高的烃源岩。北坡油气运移的传导系统是一个由断层和砂岩储层组成的复合系统。来自深部凹陷的大量石油/天然气首先沿砂体向斜坡移动，并伸展并与烃源岩连接，然后沿斜坡的断层重新分布。运动停止后，断层在砂体的上倾方向上形成闭塞作用，在北坡形成了大量的断层块状油气藏。

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