塔里木盆地轮探1 井超深层油气勘探重大发现与意义

doi:10.3969/j.issn.1672-7703.2020.02.007

摘要/Abstract

摘要： 2020 年1 月，位于塔北隆起轮南低凸起的轮探1 井在8200m 之下的下寒武统白云岩中获得轻质原油，塔里木古老克拉通超深层油气勘探获得重大突破。通过对轮探1 井发现情况描述与超深层寒武系盐下油藏发现历程分析，旨在为其他类似地区新区、新层系、新类型的勘探提供借鉴与参考。轮探1 井钻揭寒武系玉尔吐斯组一套优质烃源岩，以及阿瓦塔格组蒸发膏岩/ 沙依里克组—吾松格尔组白云岩储层与玉尔吐斯组泥岩/ 震旦系奇格布拉克组白云岩风化壳储层两套储盖组合。轮探1 井产层为吾松格尔组，为正常温压系统的挥发性油藏；震旦系奇格布拉克组风化壳获得微量天然气。塔里木盆地台盆区勘探经历了从碎屑岩到碳酸盐岩、从碳酸盐岩到盐下白云岩的两次战略转移; 轮探1 井是第二次战略转移的重要标志，具有里程碑意义。轮探1 井成藏有利条件在于具有继承性稳定古隆起与优质的生储盖组合；通过类比，分析了塔里木盆地寒武系盐下白云岩勘探前景，指出塔中—古城、塔北南斜坡、麦盖提斜坡北—柯坪等有利区为下步勘探重点区带。

关键词: 塔里木盆地, 轮探1, 超深勘探, 重大突破, 盐下白云岩

Abstract: In January 2020, light crude oil was obtained from Lower Cambrian dolomite with burial depth deeper than 8200 m in Well Luntan-1, which is located in the Lunnan low bulge in the Tabei uplift. The result indicated a major breakthrough in ultradeep oil and gas exploration in the old craton of Tarim. This paper describes the process of discovering Well Luntan-1 and analyzes the discovery history of the ultra-deep Cambrian subsalt oil reservoirs, with the intention of providing reference for the exploration of new zones, new strata and new types in other similar areas. According to drilling results from Well Luntan-1, a set of high-quality source rocks is developed in the Cambrian Yuertusi Formation, and there are 2 sets of reservoir-cap assemblage. One is evaporite gypsum cap rocks in the Awatage Formation and dolomite reservoir in the Shayilike – Wusonggeer Formations. The other is mudstone cap rocks in the Yuertusi Formation and dolomite weathering crust reservoir in the Sinian Qigebulake Formation. The production layer in Well Luntan-1 is the Wusonggeer Formation, which is a volatile-oil reservoir with normal temperature and pressure gradients. In addition, trace natural gas was obtained from the weathering crust of the Sinian Qigebulake Formation. Exploration of the platform-basin transitional area in the Tarim Basin has experienced 2 strategic shifts: from clastic rocks to carbonate rocks, and from carbonate rocks to pre-salt dolomite. Well Luntan-1 is an important symbol of the second strategic shift, which is of milestone significance. The favorable accumulation conditions of Well Luntan-1 are the successive development of stable paleo- uplift and the high-quality source-reservoir-cap assemblages. Through analogy, this paper analyzes the exploration prospects for the Cambrian pre-salt dolomite in the Tarim Basin, and points out that favorable areas, such as the Tazhong-Gucheng area, the south slope of the Tabei area, and the northern Maigaiti slope-Keping area, are the key areas for the next steps in exploration.

中图分类号:

杨海军, 陈永权, 田军, 杜金虎, 朱永峰, 李洪辉, 潘文庆, 杨鹏飞, 李勇, 安海亭. 塔里木盆地轮探1 井超深层油气勘探重大发现与意义[J]. 中国石油勘探, 2020, 25(2): 62-72.

Yang Haijun, Chen Yongquan, Tian Jun, Du Jinhu, Zhu Yongfeng, Li Honghui, Pan Wenqing, Yang Pengfei, Li Yong, An Haiting. An important discovery in Well Luntan-1 of the Tarim Basin, China, and its significance for ultra-deep oil and gas exploration[J]. China Petroleum Exploration, 2020, 25(2): 62-72.

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