塔里木盆地中深1井寒武系盐下白云岩原生油气藏的发现与勘探意义  

Discovery and Exploration of Cambrian Subsalt Dolomite Original Hydrocarbon Reservoir at Zhongshen-1 Well in Tarim Basin

作　　者：王招明[1] 谢会文[1] 陈永权[1] 齐英敏[1] 张科[1] 

机构地区：[1]中国石油塔里木油田公司,新疆库尔勒市841000

出　　处：《中国石油勘探》2014年第2期1-13,共13页China Petroleum Exploration

基　　金：国土资源部重大专项"塔里木盆地碳酸盐岩油气地质调查及战略选区(带)评价"(1212011220760)

摘　　要：塔里木盆地下古生界白云岩分布范围广,厚度大,生储盖空间配置条件优越,是盆地内重要的勘探领域。自塔里木石油会战以来,下古生界白云岩领域投入了大量勘探工作,却未获得规模性发现。2010年前后,在塔中—巴楚地区稳定的储盖组合、古隆起成藏条件更好的认识基础上,转变勘探思路,锁定塔中继承性古隆起,应用三维地震评价技术,实施了中深1井;该井在寒武系盐下白云岩获得突破,揭开了寒武系白云岩勘探的新篇章。中深1井在中下寒武统发现两套油气层,一套位于中寒武统阿瓦塔格组,以低黏度、含蜡轻质原油为主;另一套位于下寒武统肖尔布拉克组,表现为干气气藏。中深1井的突破对塔里木盆地油气勘探意义重大,首次在盆地内发现内幕白云岩油气藏,证实了寒武系盐下白云岩具备规模成藏的石油地质条件,落实了一个分布面积近30×104km2的新的战略接替领域。同时,中深1井寒武系盐下油气藏的发现,表明寒武系烃源岩可能是塔里木盆地台盆区的主要烃源岩,将对该盆地台盆区的勘探有着深远的影响。The Lower Paleozoic dolomite is widely distributed in Tarim Basin with a large thickness and good conditions for source-reservoir- cap assemblage. It is the important exploration field in the basin. Great exploration efforts have been focused on Lower Paleozoic dolomite since Tarim Basin was brought under exploration and development, but no significant discoveries have been made in this field. Based on a better understanding of the stable reservoir-cap assemblage and the accumulation conditions for palaeohigh, the exploration mindset was changed around 2010, being concentrated on the Tazhong successive palaeohigh. With application of 3D seismic assessment technology, Zhongshen-1 Well was drilled, which made a breakthrough in Cambrian subsalt dolomite and turned a new page of Cambrian dolomite exploration. Two sets of oil and gas horizons of the Middle-Lower Cambrian series were found at Zhongshen-1 Well. One set is located in Awatage Formation of the Middle Cambrian series in the form of low-density wax-containing light crude oil, while another set is located in Xiaoerbulake Formation of the Lower Cambrian series in the form of dry gas reservoir. The breakthrough of Zhongshen-1 Well is of great significance to oil and gas exploration of Tarim Basin. It is the first time to find inner-curtain dolomite hydrocarbon reservoirs in the basin, confirming the petroleum geological conditions for large-scale hydrocarbon accumulations in Cambrian subsalt dolomite and locating a new strategic replacing field which has an extensive area of nearly 30× 104km2. Meanwhile, discovery of Cambrian subsalt hydrocarbon reservoirs at Zhongshen-1 Well indicates that Cambrian source rock is likely to be the main hydrocarbon source rock in the platform-basin area of Tarim Basin. This discovery exerts a far-reaching influence on exploration of the platform-basin area of the basin.

关 键 词：塔里木盆地 中深1 寒武系 白云岩 战略突破 

分 类 号：TE122.1[石油与天然气工程—油气勘探]