摘要
准西北缘哈山地区石炭系火山岩形成于陆缘岛弧及大洋岛弧背景,是该区重要的勘探目标类型。为探究哈山地区火山岩储层发育及控制因素,以露头观测为基础,利用岩心、普通和铸体薄片、扫描电镜等手段,结合成像测井资料,对火山岩岩石学特征、储集特征及影响因素进行研究。研究认为石炭系火山岩主要由熔岩类玄武岩、安山岩和火山碎屑岩类火山角砾岩、凝灰岩和沉凝灰岩两大类5种岩性组成;储集空间包括溶蚀—裂缝型、裂缝—溶蚀型、溶蚀型三类16种;岩性和岩相是影响储层的内在因素,风化淋滤和构造作用是外在因素;风化淋滤作用主要发生在风化壳、火山喷发旋回界面和喷发期次界面下,构造作用产生的大量裂缝,改善储层渗滤性能的同时还有效地增大了储集空间;断裂交汇处的风化壳和喷发旋回与期次界面处的火山角砾岩、凝灰岩、安山岩发育区是有利储层分布区。该研究为预测哈山地区石炭系火山岩有利储层分布提供依据,为勘探部署提供理论支撑。
As important exploration targets at the northwestern margin of the Junggar basin,Carboniferous volcanic rocks formed under the background of continental island arc and oceanic island arc.In order to study the development and controlling factors of volcanic reservoirs in the Hashan area,based on outcropping observation,through studying core,ordinary and cast thin sections,scanning electron microscope and other means,combined with FMI analysis,the petrological characteristics,reservoir characteristics and influencing factors of volcanic rocks were explored.It is believed that Carboniferous volcanic rocks are mainly composed of five lithological types,which can be classified into two classes,including lava-formed rocks,such as basalt and andesite,and pyroclastic rocks,such as volcanic breccia,tuff and sedimentary tuff.There are 16 types of reservoir space,which can be classified into three larger types that are corrosion-fracture type,fracture-corrosion type and corrosion type.Lithology and lithofacies are the internal factors affecting the reservoir,while weathering,leaching and tectonics are the external factors.Weathering and leaching mainly occur under the weathering crust,the interface of volcanic eruption cycles and the interface of eruption periods.Moreover,a large number of fractures are generated by tectonism,which can not only improve the percolation performance of reservoirs,but also effectively increase the storage space.The weathering crust at the convergence zone of faults and the development areas of volcanic breccia,tuff and andesite at the interfaces of eruptive cycles and periods are favorable reservoir areas.This study provides a basis for predicting the favorable reservoir distribution of carboniferous volcanic rocks in the Hashan area and a theoretical support for exploration and deployment.
作者
于洪洲
YU Hongzhou(Exploration and Development Institute,Shengli Oil field Branch Company,SINOPEC,Dongying 257000,Shandong,China)
出处
《地质力学学报》
CSCD
2019年第2期206-214,共9页
Journal of Geomechanics
基金
国家科技重大专项(2016ZX05002-002)
关键词
火山岩
储集特征
影响因素
哈山地区
准噶尔盆地
volcanic rocks
reservoir characteristics
influencing factors
Hashan region
Junggar basin
