阿姆河右岸盐下侏罗系大中型气田地质特征与分布规律  

Geological characteristics and distribution law of pre-salt Jurassic large and medium gas fi elds in the right bank of the Amu Darya River

作　　者：王红军[1] 张良杰[1] 陈怀龙 张宏伟[1] 白振华[1] 蒋凌志[1] Wang Hongjun;Zhang Liangjie;Chen Huailong;Zhang Hongwei;Bai Zhenhua;Jiang Lingzhi(PetroChina Research Institute of Petroleum Exploration and Development;CNPC(Turkmenistan)Amu Darya River Gas Company)

机构地区：[1]中国石油勘探开发研究院,100083 [2]中国石油(土库曼斯坦)阿姆河天然气公司

出　　处：《中国石油勘探》2020年第4期52-64,共13页China Petroleum Exploration

基　　金：国家科技重大专项“海外重点探区目标评价与未来领域选区选带研究”(2016ZX05029-005);中国石油天然气集团有限公司科技项目“海外天然气藏复杂储层精细评价与预测技术”(2018D-4305)。

摘　　要：阿姆河右岸区块位于中亚阿姆河盆地东北部,天然气资源丰富,盐下中—上侏罗统碳酸盐岩是主要的油气富集层位。通过对盐下大中型气田的地质特征和成藏因素进行分析,结果表明:①盐下碳酸盐岩大中型气田可划分为叠合台内滩气田、缓坡礁滩气藏群和逆冲构造缝洞型气田3类,其中叠合台内滩气田发育孔隙(洞)型台内滩储集体,纵向叠置且隔夹层发育,形成多套气水系统;缓坡礁滩气藏群发育裂缝—孔隙(洞)型斜坡礁滩储集体,平面表现为“一礁一藏”;逆冲构造缝洞型气田发育碳酸盐岩缝洞型储集体,气水系统复杂,距主控断层越近、充注强度越高,气水界面越低。②叠合台内滩气田分布于蒸发台地—局限台地—开阔台地,气田规模受古地貌和现今构造幅度控制;缓坡礁滩气藏群位于台缘上斜坡带,天然气富集程度与古地貌高和礁滩体类型密切相关;缝洞型气田分布于山前逆冲构造带,气田内断层发育规模是高产富集主控因素。③深层中—下侏罗统碎屑岩形成了自生自储的成藏组合,具有大中型气田形成条件,喜马拉雅期改造较弱的继承性构造圈闭和凹陷带地层—岩性圈闭是有利的勘探目标。The right bank block of the Amu Darya River is located in the northeast of the Amu Darya Basin in Central Asia with abundant gas resources.The pre-salt carbonate rocks of the Middle-Upper Jurassic are the main hydrocarbon enrichment formations.The analysis of geological characteristics and hydrocarbon accumulation factors of pre-salt large and medium gas fi elds show that:(1)The pre-salt large and medium carbonate gas fi elds can be divided into three types,i.e.gas fi elds of superimposed inner-platform shoals,gas reservoir groups of ramp reef shoals and fracture-cavity type gas fi elds of thrust structure.The pore(vug)type inner-platform shoal reservoirs are developed in the gas fi elds of superimposed inner-platform shoals,which are vertically superimposed with development of barrier layers and interlayers,forming multiple sets of gas-water systems.The fracture-pore(vug)type ramp reef shoal reservoirs are developed in the gas reservoir groups of ramp reef shoals.In the plane,it is characterized as“one reservoir in one reef”.Carbonate fracture-cavity reservoirs are developed in the fracturecavity type gas fi elds of thrust structure with complicated gas-water system.The closer to the main faults,the higher the charging intensity and the lower the gas water contact.(2)The gas fi elds of superimposed inner-platform shoals were distributed in evaporate platform-restricted platform-open platform.The scale of this type gas fi eld was controlled by paleogeomorphology and present structural amplitude.The gas reservoir groups of ramp reef shoals were located on upper ramp zone of platform margin and the gas enrichment degree was closely related to the paleo-high and the type of reef-shoal.The fracture-cavity type gas fi elds were distributed in mountain-front thrust structural zones.The development scale of faults in the gas fi elds is the main controlling factor of high gas production and enrichment.(3)The deep clastic rocks of the Middle-Lower Jurassic form an hydrocarbon accumulation assemblage of self-generation

关 键 词：阿姆河盆地 盐下 侏罗系 碳酸盐岩 天然气 气藏类型 分布规律 

分 类 号：TE112[石油与天然气工程—油气勘探]