阿克库勒凸起于奇地区YQ3井奥陶系碳酸盐岩油气成藏研究

OIL & GAS ACCUMULATION IN THE MIDDLE-LOWER ORDOVICIAN CARBONATE ROCKS OF THE WELL YQ3 IN YUQI BLOCK OF THE AKEKULE UPLIFT, TARIM BASIN

于奇地区是塔河油区外围重要的油气勘探地区.以成藏理论为指导,应用荧光薄片及流体包裹体分析等技术和方法,综合研究分析了于奇地区YQ3井区中下奥陶统鹰山组碳酸盐岩油气成藏条件及成藏主控因素.研究结果表明,YQ3井区鹰山组储层类型为洞穴型、裂缝-孔洞复合型和裂缝型,洞穴、溶蚀孔隙和中小型裂缝普遍发育,但洞穴充填相当严重;区域封盖和直接封盖能力较好,但海西晚期构造运动对本井区油气保存影响较大;至少发生了4次油气注入成藏期,即海西晚期、燕山期、喜山早期和喜山中期,其中最重要的油气注入成藏期为海西晚期和喜山期;油气藏形成主要受到3种因素的控制,即油气源区是控制本井区油气分布和富集的主要因素,盖层等保存条件是控制本井区油气分布和富集的关键因素,有效储集体发育程度是控制本井区油气分布和富集的重要因素.

Yuqi block is an important oil ＆ gas exploration play of Tahe oilfield in Akekule uplift,Tarim Basin. The oil ＆ gas accumulation in the Middle-Lower Ordovician Yingshan Formation carbonate rocks of the Well YQ3 in Yuqi block are studied, main factors controlling hydrocarbon accumulation are analyzed by using the techniques of fluorescence slice and fluid inclusion under the guidance of the theories of oil ＆ gas accumulation. It is demonstrated that the carbonate rock reservoirs of the Well YQ3 are cave, fracture-hole and fracture type, there are a large number of Caves, corrosion holes,and medium-miniature fractures in the Well YQ3, but Cave filling is very serious, the seal conditions of Lower Carboniferous mudstone seal rocks are fair, but late Hercynia structural event is the most important influence element on petroleum preservation; there is existed four oil/gas charge in the Middle-Lower Ordovician Yingshan Formation carbonate rocks of the Well YQ3 in Yuqi block, and the most important charge periods are late Hercynian and Himalayan（Cenozoic）; there were three main factors controlling hydrocarbon accumulations.