济阳坳陷埕岛-桩海地区中生界潜山储层岩性与储层质量

本文以渤海湾盆地济阳坳陷埕岛-桩海地区中生界复杂岩性潜山型储层为研究对象，对储层岩石学特征、储集空间类型和储层物性差异进行研究，进而讨论储层质量控制因素。研究结果表明，研究区内储层包含火成岩和碎屑岩两大类，火成岩以安山岩和火山角砾岩为主，分布局限；碎屑岩形成于辫状河三角洲相，是研究区储层发育的有利岩性。有效储层储集空间类型以次生溶蚀孔为主，残留原生气孔是安山岩中的主要孔隙，裂缝常被方解石充填。研究区储层非均质性强，样品孔、渗值分布范围大。储层质量受到多种因素控制，从根本上而言，不同岩性-岩相或沉积相的样品初始孔隙度差异明显，初始孔隙度较高储层其现今孔隙度也较好；对于相同岩性岩相的储层而言，成岩作用差异是决定性因素，压实和碳酸盐胶结作用是研究区储层主要的减孔作用。

Lithology and Reservoir quality of Mesozoic Buried Hill in the Chengdao-Zhuanghai Area, the Jiyang Depression

The complex lithology of Mesozoic buried-hill reservoirs in the Chengdao-Zhuanghai area of the Jiyang Depression, Bohai Bay Basin has been studied in this paper. The petrological characteristics, pore space, and reservoir quality of these rocks have been analyzed. Controlling factors of reservoir quality are also discussed. The result shows that the reservoir lithology in the study area includes igneous rocks and clastic rocks. The igneous rocks are dominated by andesite and volcanic breccia with limited distribution; clastic rocks are formed in braided river delta facies from which the advantage reservoir develops in the study area. Secondary dissolution pores are the main reservoir space. The remaining primary pores are mainly discovered in andesite, while the fractures are often filled by calcite. The reservoir in the study area has strong heterogeneity, and the sample porosity and permeability have a large distribution range. Reservoir quality is controlled by many factors. Fundamentally, the initial porosity of samples from different lithology-lithofacies or sedimentary facies is significantly different. Those with higher initial porosity also show a better performance in current porosity comparations. For the same type of rock, the difference in diagenesis is the decisive factor, compaction and carbonate cementation are the main pore-reducing effects of the reservoirs in the study area.