松辽盆地长岭断陷火山岩相与天然气成藏关系

RELATIONSHIP BETWEEN VOLCANIC FACIES AND GAS ACCUMULATION IN THE CHANGLING FAULT-DEPRESSION OF THE SONGLIAO BASIN

秦伟军 刘超英 谈风其 高中哲 毛根塔

Qin Weijun Liu Chaoying Tan Fengqi Gao Zhongzhe Mao Genta

中国石油化工股份有限公司, 石油勘探开发研究院, 北京, 100083 2. 吉林大学, 地球探测科学与技术学院, 长春, 130026 3. 中国石油天然气集团公司, 东方地球物理勘探有限责任公司, 研究院, 河北, 涿州, 072750

Research Institute of Petroleum Exploration and Production, SINOPEC, Beijing 100083, China 2. College of Geo-exploration Science and Technology, Jilin University, Changchun, Jilin 130026, China 3. Research Institute of BGP, CNPC, Zhuozhou, Hebei 072750, China

松辽盆地盖层由上部坳陷层和下部断陷层组成。长岭断陷是断陷层的一部分,是受盆地早期发育的孙吴—双辽、松花江—四平2条岩石圈深断裂带控制的深大断陷。断陷内部及周边断裂深切岩石圈,造成多期火山活动,形成火山岩与巨厚湖相沉积岩共生。火山岩以酸性火山岩类为主,分爆发相和溢流相2种类型,两者在剖面上交替出现构成多个火山活动旋回。研究认为,喷溢相的上部亚相原生气孔发育,爆发相的空落亚相和热基浪亚相孔洞发育。火山岩相与天然气成藏关系主要表现为,喷溢相上部亚相、爆发相空落亚相和热基浪亚相控制了好储层发育,好储层又控制了气藏形成。

Caprock structure in the Songliao Basin is composed of the upper depression layers and the lower fault-depression layers.The Changling Fault-Depression(part of the fault-depression layers) is a deep-large fault-depression controlled by the Sunwu-Shuangliao and the Songhuajang-Siping Deep Fault Belts generated during basin early phase.Deep faults in and around the fault-depression cut deep into lithosphere,causing volcanic activities,resulting in association of volcanic rocks and lacustrine facies sedimentary rocks.Volcanic rocks are mainly acid,and can be divided into 2 types: explosive and outpouring.The 2 facies alternate and compose multiple volcanic activity cycles.Primary vesicles gene-rate in the upper subfacies of the explosive facies.Pores and caverns generate in the aerial-falling and thermodynamic wave subfacies of the outpouring facies.Good reservoirs generate controlled by the upper subfacies of the explosive facies and the aerial-falling and thermodynamic wave subfacies of the outpouring facies;hence control gas accumulation formation.

中国石油化工股份有限公司油气勘探先导项目(06—ZS—YTB012)

https://doi.org/10.11781/sysydz200804328