摘要
基于岩心观察、薄片鉴定、成像测井及物性等资料,结合地球化学分析,塔里木盆地玉北地区奥陶系岩溶储层具有明显的"上下分层、东西分异"特征。纵向上储层可以分为3套,分别为表层(以鹰山组上段为主)、鹰山组下段和蓬莱坝组,表层储层储集空间以裂缝型为主,鹰山组下段以裂缝-溶蚀孔洞型为主,蓬莱坝组则以溶蚀孔洞型为主。平面上储层特征具有明显差异,东部断褶区的断裂带,储层发育,以裂缝型为主,东部断褶区的断洼区、中部平台区及西部斜坡区,储层相对较差。纵向上按成因分类,将储层划分为2种类型:表层风化壳岩溶型和内幕断控岩溶型。建立了玉北地区储层发育地质模式。表层风化壳岩溶储层主要分布在南部斜坡区、中部平台区、东部断褶区的断裂带、西部斜坡区罗斯2井区的断裂带等古构造高部位,断控岩溶储层主要沿规模断裂分布。指出中部平台区为下一步有利勘探区带。
The Ordovician reservoir has a good potential for oil and gas exploration in Yubei area,Tarim Basin.Based on the cores,thin sections,imaging logging,physical property data,and geochemical data,the karst reservoirs of Lower-Middle Ordovician in Yubei area have obvious features of"stratification from upper to lower and differentiation from east to west".Longitudinally,there are three sets of reservoirs:the upper section of Yingshan Formation,mainly fracture type;the lower section of Yingshan Formation,mainly fracture-vug type;and the Penglaiba Formation,mainly vug type.Horizontally,the reservoirs developed in the eastern fault zone,mainly fracture type,while it is relatively poor in the central and western regions.According to the palaeo-geomorphology and fracture evolution,the Ordovician reservoir can be divided into two genetic types:weathering crust karst reservoir,mainly distributed in the high parts of palaeo-structures,and fault-controlled karst reservoir,mainly distributed along larger scale fractures.The model of Ordovician reservoir is established in Yubei area,by which the central platform of Yubei could be the next favorable play.
作者
林新
龚伟
余腾孝
刘少杰
于静芳
LIN Xin;GONG Wei;YU Tengxiao;LIU Shaojie;YU Jingfang
出处
《海相油气地质》
CSCD
北大核心
2018年第3期11-20,共10页
Marine Origin Petroleum Geology
基金
中国石油化工股份有限公司科技攻关项目"塔里木盆地寒武系-中下奥陶统储层发育模式研究"(编号:2016KYSH03)资助
关键词
塔里木盆地
玉北地区
奥陶系
储层成因
储层分布
风化壳
岩溶储层
reservoir genesis
reservoir type
weathering crust karst reservoir
fault-controlled karst reservoir
Ordovician
Yubei area
Tarim Basin