Abstract:

Hanilcatam area in Tarim Basin is abundant in hydrocarbon which is an important hydrocarbon exploration area and complex geology conditions. Based on the analysis of the geology，fluid，oil/gas distribution，and the controlling factors of Ha 8 Area in Hanilcatam buried hill，we conclude that the oil and water distribution of the zone is complex and the fluids with no zonation. During Caledonian and early Hercynian，Yingshan and Yijianfang Formation of Ordovician were reformed by polyphase carst，and hole-fracture reservoir developed well，which provides the well reservoir for hydrocarbon charge. Due to the rise and denudation of the Ordovician layers in buried hill karst area，Tumuxiuke as well as the above layers is closely related to the paleo oil reservoirs conservation. Fault kind and local structure controls the late hydrocarbon charging intensity and the reservoir types. The above factors result in relative singular migration-accumulation systems in wells Ha801，Ha8， Ha802，etc. This research is helpful exploration and exploitation of the carbonate buried hill reservoir′s.

Key words: buried hill reservoir, marine carbonate, weathering crust karst, Hanilcatam, Tarim Basin