塔河油田石炭系卡拉沙依组勘探有利区带精细评价  

A fine scale assessment of favorable exploration areas in the Carboniferous Kalashayi Formation in the Tahe oil field

作　　者：杜伟维[1] 石媛媛[1] 洪才均[1] 

机构地区：[1]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830013

出　　处：《石油实验地质》2017年第4期580-586,共7页Petroleum Geology & Experiment

基　　金：中国石油化工股份有限公司油田事业部重大勘探先导项目"塔里木盆地古生界碎屑岩重点区带评价与突破目标优选"(P12056)资助

摘　　要：石炭系卡拉沙依组是塔河油田碎屑岩领域最具潜力的层系之一,但埋藏深,砂体规模小,油气成藏主控因素不明,亟需开展区带精细评价。通过分析石炭系卡拉沙依组油气分布特征、断裂体系、砂体以及下伏地层等成藏控制因素,采用"多图叠合"方法,叠合油气藏分布及油气显示图、断裂分布图、沉积相图、地层展布图,形成卡拉沙依组综合评价图,平面上将研究区划分为3个区带,并指明下步勘探的圈闭类型。其中,最有利区以寻找水下分流河道、"片状"分布的水下决口扇、河口坝等岩性圈闭为主;有利区以寻找被潮汐改造的"条带状"分布的水下分流河道、河口坝及席状砂岩性圈闭为主;潜力区以寻找"片状"分布的砂坪岩性圈闭为主。The Carboniferous Kalashayi Formation in the Tahe oil field shows a good potential for hydrocarbon exploration in clastic rocks. Deep burial depth, small sand body scale and complicated controlling factors for hydrocarbon accumulation have made it necessary for a fine scale assessment of the study area. The controlling factors for hydrocarbon accumulation in the Carboniferous Kalashayi Formation, such as oil and gas distribution, fault systems, sand bodies and underlying strata, were analyzed. The maps of reservoir distribution, oil and gas shows, fault location, sedimentary facies and strata layout were applied to make a comprehensive evaluation of the Kalashayi Formation. The study area was divided into three zones. In the most favorable area, we focus on lithologic traps such as underwater distributary channels, underwater flood fans distributed like flakes, and mouth bars. In the favorable area, we look for banded underwater distributary channels, mouth bars and sheet sandstones which were reformed by tides. In the potential area, we look for sand flats distributed like flakes.

关 键 词：成藏主控因素 区带精细评价 卡拉沙依组 石炭系 塔河油田 

分 类 号：TE122.3[石油与天然气工程—油气勘探]