济阳坳陷页岩油富集主控因素  

Main control factors of enrichment characteristics of shale oil in Jiyang depression

作　　者：王勇[1] 宋国奇[2] 刘惠民[1] 姜秀芳[1] 郝雪峰[1] 宁方兴[1] 朱德顺[1] 林璐[1] 

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [2]中国石化胜利油田分公司,山东东营257000

出　　处：《油气地质与采收率》2015年第4期20-25,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家重点基础研究发展规划"陆相页岩油富集要素与有利区预测"(2014CB239104)

摘　　要：依据页岩油储集类型、常规油气探明储量单层有效厚度、获页岩油井夹层厚度和夹层比例的分布特征,将济阳坳陷页岩油富集类型划分为基质型、裂缝型和夹层型3种,其中夹层型页岩油夹层厚度上限为2.5 m,夹层比例上限为20%。利用典型井解剖和数理统计相结合的方法,对不同类型页岩油富集主控因素进行了剖析。基质型页岩油富集主控因素包括岩相、储集性能、异常压力和页岩油可动性,其中富有机质纹层状泥质灰岩相和富有机质灰质泥岩相最为有利;出油井段孔隙度大于3%,且储集物性和日产油量呈明显的正相关;异常高压区内的相对低压区页岩油相对富集;S1/TOC>1层段页岩油流动性好。裂缝型页岩油富集主控因素包括岩相、裂缝发育程度和封存条件,其中纹层状岩相易形成网状缝,控制了裂缝型页岩油纵向展布;裂缝发育系数大于0.2范围内裂缝发育,裂缝型高产井主要分布在距断层距离小于1.2 km、断距大于100 m的断裂上盘;异常高压区(压力系数大于1.3)页岩油封存条件好,页岩油富集。夹层型页岩油富集主控因素包括储集物性、烃源岩排烃强度和异常压力。Based on shale oil reservoir types,effective single layer thickness distribution of conventional oil and gas in the area with proved reserves,and thickness distribution and proportion of interbed in wells drilling at shale oil,the shale oil enrichment types in Jiyang depression are divided into matrix,fracture and interbed with a thickness not more than 2.5 m and a proportion not more than 20%. By typical well analyzing and mathematical statistics,factors for shale oil enrichment were analyzed. Enrichment factors of the matrix type include lithofacies,reservoir performance,abnormal pressures and shale oil mobility. Organic-rich layered muddy limestone and organic-rich lime mudstone are the most favorable lithofacies. The porosity of oil charging segment is more than 3%. And there is a significant positive correlation between reservoir properties and the daily outputs. The low-pressure area among abnormal high pressure areas is relatively enriched in shale oil. The mobility of shale oil is good while S1/ TOC >1. Enrichment factors of the fractured type include lithofacies,fracture development extent and fault sealing,and the layered lithofacies is easy to form net fracture and controls vertical distribution of fracture-type shale oil. Fractures develop when fracture development coefficient is more than 0.2. High-yield wells distribute in hanging wall of fault where the distance between well and fault is less than 1.2 km and fault throw is more than100 m. Shale oil enriches in abnormal high pressure area(pressure coefficient>1.3)which is in good preservation conditions.Enrichment factors of the interbed type include reservoir property,source rock expulsion intensity and abnormal pressure.

关 键 词：页岩油 裂缝型 基质型 夹层型 岩相 富集主控因素 济阳坳陷 

分 类 号：TE112[石油与天然气工程—油气勘探]