摘要
基于芦1井、马56-12井等12口井586m岩心描述及上万块样品化验数据,对三塘湖盆地二叠系两类非常规石油形成的地质条件和资源潜力进行研究,探索效益勘探开发配套技术。研究表明:①三塘湖盆地二叠系非常规石油蕴藏于火山活动间歇期浅湖—深湖环境下沉积的泥质生油岩内部或紧邻生油岩的沉凝灰岩中,已发现中二叠统条湖组(P2t)致密油和芦草沟组(P2l)页岩油两类非常规石油资源。②芦草沟组是主力烃源岩,岩性以泥质岩类为主,母质类型为Ⅰ—Ⅱ2,有机碳含量普遍大于2%,R o介于0.5%~1.3%,处于低成熟—成熟阶段。③储层岩性复杂,以沉凝灰岩、白云质凝灰岩为主,其次为凝灰质白云岩、泥晶白云岩;脆性矿物含量普遍大于70%,黏土矿物含量小于10%,储集空间以晶间微孔、粒间微孔及溶蚀微孔为主;条湖组致密油储层表现为高孔隙度、低渗透率、高含油饱和度特点,芦草沟组页岩油储层渗透率与条湖组致密油储层相当,孔隙度、含油饱和度普遍低于前者。④原油均为中质—重质油,密度为0.85~0.90g/cm3;压力系数为1.0~1.4,为常压系统;油层分布受优质烃源岩及有效储层共同控制。初步预测,二叠系非常规石油资源主要分布在芦草沟组,勘探潜力大,马朗凹陷中部、条湖凹陷中南部是扩展勘探和建产的重要领域。勘探开发实践证明,水平井体积压裂技术是实现非常规石油有效动用的关键,勘探开发一体化是实现效益开发的重要保障。
Based on the description of 586m-long cores from 12 wells such as Lu1 and Ma56-12,and the analytical data of over ten thousand samples,the geological conditions and resource potentials of two types of unconventional Permian oil in the Santanghu Basin were analyzed,and supporting technologies were developed for economic exploration and development.The following study results were obtained:①Unconventional Permian oil accumulated in the argillaceous source rock or the adjacent tuff reservoir depositing in the shallow-deep lake during intermittent volcanic activities.Two types of unconventional oil resources were discovered:tight oil of the Middle Permian Tiaohu Formation(P2t)and shale oil of the Lucaogou Formation(P2l).②The Lucaogou Formation is the primary source rock dominated by argillaceous rock.The kerogen is typeⅠ-Ⅱ2,TOC is generally more than 2%,and R o ranges from 0.5%to 1.3%,indicating low maturity.③The reservoir is complex,composed of more sedimentary tuff and dolomitic tuff,and less tuffaceous dolomite and argillaceous dolomite.Brittle minerals are generally more than 70%and clay minerals are less than 10%.The reservoir space is dominated by intergranular micropores,intergranular micropores and dissolved micropores.The Tiaohu tight oil reservoir is of high porosity,low permeability and high oil saturation,while the Lucaogou shale oil reservoir has the similar permeability to the Tiaohu tight oil reservoir,but the porosity and oil saturation are generally lower than those of the Tiaohu tight oil reservoir.④The crude oil is medium to heavy,and the density is 0.85-0.90g/cm3,the pressure coefficient is 1.0-1.4(a common pressure system).The reservoir distribution is controlled by both good source rocks and effective reservoirs.Preliminary prediction shows that the unconventional Permian oil resources,mainly distributed in the Lucaogou Formation,and showing a great exploration potential.The central part of the Malang sag and the south-central part of the Tiaohu sag are important for expanding exploration and production.Exploration and development practice have proved that horizontal wells and volume fracturing stimulation are effective to produce the unconventional oil,and integration of exploration and development can guarantee the economic development of the unconventional oil.
作者
梁世君
罗劝生
王瑞
陈旋
杨斌
马强
梁辉
Liang Shijun;Luo Quansheng;Wang Rui;Chen Xuan;Yang Bin;Ma Qiang;Liang Hui(PetroChina Tuha Oilfield Company;Exploration Division,PetroChina Tuha Oilfield Company;Research Institute of Petroleum Exploration and Development,PetroChina Tuha Oilfield Company)
出处
《中国石油勘探》
CAS
CSCD
北大核心
2019年第5期624-635,共12页
China Petroleum Exploration
基金
中国石油天然气股份有限公司重大科技专项“新疆油田和吐哈油田勘探开发关键技术研究与应用”（2017E-04-04）
关键词
页岩油
致密油
沉凝灰岩
水平井
体积压裂
储层甜点
三塘湖盆地
shale oil
tight oil
sedimentary tuff
horizontal well
volume fracturing
sweet spots
Santanghu Basin
