辽河坳陷东部滩海深层—超深层天然气勘探重大发现及意义  

Great discovery and significance of natural gas exploration in deep to ultra-deep formation in eastern tidal zone of Liaohe Depression

作　　者：胡英杰 蔡国钢 刘兴周 周艳 解宝国 杨光达 郭平 张东伟 翁文胜 王伟成 邹丙方 崔向东 Hu Yingjie;Cai Guogang;Liu Xingzhou;Zhou Yan;Xie Baoguo;Yang Guangda;Guo Ping;Zhang Dongwei;Weng Wensheng;Wang Weicheng;Zou Bingfang;Cui Xiangdong(PetroChina Liaohe Oilfield Company,124010)

机构地区：[1]中国石油辽河油田公司,124010

出　　处：《中国石油勘探》2023年第2期24-34,共11页China Petroleum Exploration

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“重点盆地风险勘探领域和目标研究、工程技术攻关及现场试验”(2022KT0502)。

摘　　要：随着勘探开发程度的日益提高,“深层—超深层能否突破”已成为制约中国东部老油区稳定发展的重要科学问题。矿权面积较小的辽河油田该问题尤其突出,对于湖盆狭长、资料品质较差的辽河坳陷深层难度极大。通过区域构造演化分析及生烃、成藏两大动力学研究,明确了辽河坳陷东部滩海成盆、成烃、成藏机制。原始湖盆为箕状结构,受其控制主力烃源岩具有“深、大、广”分布特征;深层发育干酪根热解、原油裂解两种成因的成熟—高成熟天然气,资源潜力大;沉积充填序列中的多套泥质岩类与早期走滑剪切断层双因素耦合造就深层—超深层为独立的“流体封存箱”,具有自生自储、旁生侧储两种运聚方式的成藏模式,具备大中型天然气田形成的有利地质条件。风险探井葵探1井取得勘探重大突破,对进一步深化辽河坳陷乃至断陷盆地深层—超深层油气勘探具有重大实践和成藏理论指导意义。With the increasing degree of exploration and development,“whether breakthroughs can be achieved in deep to ultra-deep formation”has become an important scientific issue affecting the stable development of mature oil fields in eastern China.It is particularly prominent in Liaohe Oilfield due to the small mining rights area,and extremely difficult in Liaohe Depression because of its narrow lake basin and poor data quality.The regional tectonic evolution is analyzed and hydrocarbon-generating kinetics and hydrocarbon accumulation dynamics are researched to identify the mechanisms of basin formation,hydrocarbon generation and accumulation in eastern tidal zone of Liaohe Depression.The study results show that:(1)Controlled by the dustpan structure of the protype lake basin,the main source rocks were characterized by“great burial depth,large thickness and wide distribution area”;(2)Two genetic types of mature-highly mature gas,i.e.,kerogen pyrolysis type and crude oil cracking type,were developed in deep formation,showing great resource potential;(3)An independent“fluid sealing box”was developed in deep to ultra-deep formation by the coupling of two factors of multi-set argillaceous rocks in the sedimentary filling sequence and the early strike-slip shear faults,forming two types of hydrocarbon accumulation modes,namely selfgeneration and self-storage type and side-generation and side-storage type,which had favorable geological conditions for the formation of medium to large-scale gas reservoir.A major breakthrough has been achieved in risk exploration well Kuitan 1,which provide significant practical and hydrocarbon accumulation theory guidance to further deepen the exploration of deep to ultra-deep formation in Liaohe Depression and even fault basins.

关 键 词：辽河坳陷 滩海 深层—超深层 流体封存箱 天然气 成藏模式 勘探发现 

分 类 号：TE122.2[石油与天然气工程—油气勘探]