松辽盆地营城组火山岩定量储层地质模型及其精细描述

储层地质模型指火山岩的岩性岩相和储层物性的空间分布。通过对营城组火山岩剖面的详细研究，结合2口钻井的岩心资料，详细划分对比储层单元，定量刻画火山岩储层。研究区火山岩相呈喷溢相→爆发相→喷溢相+侵出相→火山沉积相→爆发相→火山通道相＋喷溢相的序列特征。爆发相、喷溢相规模最大，各亚相侧向延伸在400～4 000 m，单层厚度为2～130 m；火山通道相、侵出相和火山沉积相的规模较小，侧向延伸为110～1 500 m，单层厚度为3～85 m。营下段为Ⅰ类、Ⅲ类储层，营一段为Ⅰ类、Ⅱ类储层夹Ⅳ类储层，营二段为Ⅰ类储层，营三段为互层的Ⅰ类、Ⅱ类、Ⅲ类储层夹薄层Ⅳ类储层。上部亚相、火山颈亚相、内带亚相是最好储层，下部亚相、隐爆角砾岩亚相为较好储层，爆发相为中等储层，中部亚相、火山沉积相为差储层。火山熔岩类物性随埋深增加变化小，火山碎屑岩类物性随埋深增加变化大，低孔、低渗岩石的物性随埋深增加变化小。

Geologic Model Quantification and Characterization for Volcanic Reservoir of the Yingcheng Formation in Songliao Basin

Here reservoir geologic model refers to the spatial distribution characteristics of lithology, lithofacies and porosity & permeability for reservoir volcanic rocks. Field sections and two drilling wells are studied in detail here, reservoir units are divided and compared, and thus the volcanic reservoirs of the area are finally quantified and characterized. Volcanic facies sequence in the area under study is mainly effusive facies→ explosive facies→ effusive facies & extrusive facies→ volcanic sedimentary facies→ explosive facies→ volcanic conduit facies & effusive facies. Explosive facies and effusive facies are of the largest scales, with lateral ranging of some subfacies from 400 m to 4 000 m and thickness of a single layer ranging from 2 m to 130 m. Volcanic conduit facies, extrusive facies and volcanic sedimentary facies are smaller, lateral range is from 110 m to 1 500 m and thickness of single layer is from 3m to 85 m. According to volcanic reservoir classifying standards, the lower member of the Yingcheng Formation is the first and third grade, the 1st member is the first and second grade, with the fourth grade, the 2nd member is the first grade, and the 3rd member is interbedded by the first, second and third grades with thin layers of the fourth grade. The upper subfacies, volcanic neck subfacies and inner subfacies are the best volcanic reservoirs. The lower subfacies and hydrothermal breccias subfacies are better volcanic reservoirs, the explosive facies is middle, and the middle subfacies and volcanic sedimentary facies are bad volcanic reservoirs. Porosity and permeability of volcanic lavas would be slightly affected by their buried depth, while pyroclastic rocks would be getting worse with increasing buried depth. Volcanic rocks with low porosity and low permeability would be affected little by their buried depth.