塔里木盆地古城墟隆起鹰山组内幕储层特征及影响因素

GL1井和GC6井的钻探证实古城墟隆起奥陶系鹰山组内幕发育了一套有利的含气层系,其岩性主要为灰色灰质白云岩、粉—细晶云岩。对GL1井岩心、薄片及成像测井资料的对比分析表明,该套储层的储集空间主要为溶蚀孔洞、晶间（溶）孔及裂缝,储层类型主要为溶蚀孔洞-裂缝型。综合研究表明,古城墟隆起鹰山组内幕储层主要受岩性组合、构造破裂和埋藏溶蚀作用影响。岩性组合对差异溶蚀作用有重要影响,灰质云岩较有利于优质储层发育;构造破裂作用对脆性白云岩储层的改造作用大;有机酸及高温热液使得埋藏溶蚀作用成为重要的建设性成岩作用。该项研究有益于古城墟隆起鹰山组内幕储层有利发育区的预测,同时对该区下一步的油气勘探也具有指导意义。

Reservoir characteristics and influencing factors in the inner Yingshan Formation in Guchengxu uplift, Tarim Basin

The drilling result of GL1 and GC 6 well confirmed that a set of gas-bearing strata developed in the inner Yingshan Formation in Guchengxu uplift. The lithology is mainly composed of limy dolomite and fine-grained dolomite. Through comprehensive use of cores, slices and logging data, the reservoir space mainly comprises dissolved pores, intercrystalline （corroded） pores and cracks, and the reservoir type is fractured and cavernous reservoir. The reservoir of inner Yingshan Formation is mainly affected by the lithology combination, structure crack and buried dissolution in Guchengxu uplift. Lithology combination has an important effect on the buried dissolution. The limy dolomite is conducive to the development of the reservoir, the structural fracturing is the key factor for the reformation of brittle dolomite reservoir, and buried dissolution is important constructive diagenesis by the organic acid and high temperature hydrothermal. The study will be beneficial to the reservoir favorable area prediction of Yingshan formation in Guchengxu uplift, and has significance for guiding the further oil and gas exploration.