摘要
下古生界碳酸盐岩潜山是渤海湾盆地重要的油气勘探领域,目前已发现的碳酸盐岩潜山油气藏主要集中在构造高部位,对构造低部位斜坡带碳酸盐岩潜山的储层发育程度以及成藏规模还缺乏深入认识。为了探索斜坡带碳酸盐岩潜山储层发育规律,明确油气成藏条件,本研究以沙垒田西北(沙西北)斜坡带为靶区,开展了潜山构造演化、储集空间形成机理、潜山油气成藏综合分析。结果表明:沙西北斜坡带下古生界潜山岩性由上组合(大套灰岩夹白云岩、泥灰岩)和下组合(鲕粒灰岩、灰岩和泥岩互层)组成,崮山组区域稳定泥岩是二者的分界线;斜坡带潜山经历印支期、燕山早期、燕山中期、燕山晚期和喜马拉雅期五期构造运动,具有跷跷板式构造演化特征,多期构造活动形成的大量裂缝为储层发育奠定基础,优势岩性组合-叠合应力成缝-多期岩溶改造三元耦合控制碳酸盐岩潜山储层发育,上组合形成似层状缝溶型优质储层,是优势的油气聚集层系;低斜坡碳酸盐岩潜山处于烃源岩超压中心与常压储层直接接触的常超过渡带,发育上组合表生岩溶成储-下组合致密层遮挡封盖的地层侧封油气成藏模式,形成斜坡带大中型油田群。
Lower Paleozoic carbonate buried hill is an important oil and gas exploration field in Bohai Bay basin.The existing buried hill is mainly concentrated in the high structural position.The reservoir development and hydrocarbon accumulation scale in the low structural position of low slope carbonate buried hill are less understood.In order to understand the developing principles of slope carbonate buried hill and the forming conditions of hydrocarbon accumulations,the tectonic evolution of buried hill,the genetic mechanism of reservoir spaces,the comprehensive analysis of hydrocarbon accumulation were carried out in northwest Shaleitian.It is concluded that:1)The lithology of the lower Paleozoic buried hill in the slope belt of northwest Shaleitian is composed of the upper association(large set of limestone and muddy limestone)and the lower association(oolitic limestone,interbedded limestone and mudstone),the stable mudstone in the Gushan Formation is the boundary between these two units.2)The buried hill in the slope zone have undergone five periods of tectonic movements,namely the Indosinian,the Early Yanshanian,the Middle Yanshanian,the Late Yanshanian,and the Xishanian,and had the characteristics of seesaw-type structural evolution.A large number of fractures formed by multi-stage tectonic activities is favorable for the foundation of reservoirs.The component coupling of dominant lithology,superposition stress fracture formation and multi-stage karst transformation controlled the development of carbonate buried hill reservoirs,forming stratiform fracture-soluble high-quality reservoirs,of which the upper association is the dominant oil-gas accumulation layer.3)The low-slope carbonate buried hill is located in the transitional zone,with the oil-gas accumulation model of upper supergene karst reservoir-lower dense layer shielding and sealing formation,forming large and medium-sized oilfield groups in the slope area.
作者
黄志
叶涛
肖述光
李飞
高文博
戴建芳
Huang Zhi;Ye Tao;Xiao Shuguang;Li Fei;Gao Wenbo;Dai Jianfang(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)
出处
《吉林大学学报（地球科学版）》
CAS
CSCD
北大核心
2024年第6期1815-1828,共14页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(41972313,41790453)。
关键词
碳酸盐岩
斜坡带潜山
缝溶型储层
地层侧封
油气成藏
渤海海域
carbonate rock
slope type buried hill
fracture-soluble reservoir
stratigraphic lateral sealing
Oil-gas accumulation
Bohai Sea
