河套盆地河探101井超深层油气重大发现及勘探潜力  

Major oil and gas discovery and exploration potential in ultra-deep formation in Well Hetan 101,Hetao Basin

作　　者：张锐锋 王浩宇 冯广业 刘静 陈树光 彭宇 王丹玲 Zhang Ruifeng;Wang Haoyu;Feng Guangye;Liu Jing;Chen Shuguang;Peng Yu;Wang Danling(PetroChina Huabei Oilfield Company)

机构地区：[1]中国石油华北油田公司,062552

出　　处：《中国石油勘探》2024年第5期77-90,共14页China Petroleum Exploration

基　　金：中国石油天然气股份有限公司基础性、前瞻性重大攻关课题“河套盆地油气富集规律与勘探关键技术研究”(2021DJ0703);中国石油天然气股份有限公司攻关性、应用性科技重大专项“超深层碎屑岩油气规模增储上产与勘探开发技术研究”(2023ZZ14)。

摘　　要：河套盆地作为晚期快速沉降、晚期成藏的含油气盆地,油气资源丰富,为探索临河坳陷洼槽区超深层油气成藏潜力,在光明构造部署钻探河探101井,在6500m以深的古近系临河组获重大突破,获日产油1285.77m^(3)、天然气1×10^(4)m^(3)高产油气流。在洼槽区开展深层—超深层成藏条件综合研究认为,储集砂体具有高刚性颗粒含量(平均为85%)、低地温梯度(2.3℃/100m)、长期浅埋—晚深埋、低填隙物含量(小于5%)的特点,使得6500m以深大量保存异常高孔储层;生烃增压、泥岩欠压实提供了油气运移动力,但受滑脱断层影响,超压仅在光明构造发育,洼槽区地层压力系数可达2.0~2.3,形成源储共生、自生自储的构造油气藏;源内生烃形成的垂直裂缝,沟通多套烃源岩层系与高渗砂体,可形成超深层储源同聚、孔缝连通的超高压力油气藏。河探101井的成功钻探再次证明陆相断陷盆地深层、超深层油气勘探开发前景广阔,光明构造有望成为新的整装高效规模储量区,展现了一个超深层富集高产油气勘探新领域,为河套盆地百万吨油田建设提供了坚实的资源保障。Hetao Basin,a proliferous basin showing rapid subsidence and hydrocarbon accumulation in the late stage,has abundant oil and gas resources.In order to identify the potential of ultra-deep oil and gas reservoirs in sub-sag area in Linhe Depression,Well Hetan 101 was deployed and drilled in Guangming structure,and a significant breakthrough was made in Linhe Formation at a depth of greater than 6500 m,with an oil rate of 1285.77 m^(3)/d and a gas rate of 1×10^(4) m^(3)/d.A comprehensive study on hydrocarbon accumulation conditions in the deep to ultra-deep formations in the sub-sag area has been conducted.The study result suggests that the reservoir sand body has the characteristics of high rigid particle content(average of 85%),low geothermal gradient(2.3℃/100m),long-term shallow burial-late deep burial,and low interstitial material content(less than 5%),enabling the preservation of abnormally high-porosity reservoirs at a depth of greater than 6500 m.The pressurization after hydrocarbon generation and under-compaction of mudstone provided driving force for hydrocarbon migration.However,due to the influence of detachment faults,over-pressure only occurred in Guangming structure,with formation pressure coefficient reaching up to 2.0-2.3 in the sub-sag area,forming a self-generation and self-storage type structural oil and gas reservoir with co-occurrence of source rock and reservoir.The vertical fractures in source rock formed by hydrocarbon generation connected multiple sets of source rocks and high-permeability sand bodies,forming ultra-high pressure oil and gas reservoirs both in source rock and reservoir in ultra-deep formations with connected pores and fractures.The successful drilling of Well Hetan 101 once again confirms the broad prospects of petroleum exploration and development in deep and ultra-deep formations in continental fault basins.Guangming structure is expected to become a new large-scale integral and high-efficiency reserve area,demonstrating a new exploration field with high-yield oil and ga

关 键 词：河套盆地 河探101井 超深层 重大发现 勘探方向 

分 类 号：TE122.1[石油与天然气工程—油气勘探]