本文關(guān)鍵詞： 深層儲集層 致密砂巖 天然裂縫 成因類型 形成序列 庫車前陸沖斷帶　出處：《石油勘探與開發(fā)》2017年03期 　論文類型：期刊論文

【摘要】：以庫車前陸沖斷帶深層白堊系巴什基奇克組砂巖儲集層為例,利用地表露頭、巖心、薄片和成像測井等資料,運(yùn)用工業(yè)CT、激光共聚焦、陰極發(fā)光、電子探針、掃描電鏡等技術(shù)手段,基于裂縫開度大小對裂縫進(jìn)行分級分類,系統(tǒng)研究庫車前陸沖斷帶砂巖儲集層天然裂縫類型、特征、成因、期次及形成序列等,并分析不同尺度天然裂縫的儲集意義。庫車前陸沖斷帶深層致密砂巖儲集層天然裂縫可分為4級:百微米級以上宏觀構(gòu)造裂縫(Ⅰ級)切割單砂體,形成優(yōu)勢運(yùn)移通道,提高儲集層滲透率;十微米級—百微米級微細(xì)構(gòu)造伴生縫(Ⅱ級)切割基質(zhì)顆粒,連通基質(zhì)大孔隙,改善滲流性能;微米級粒緣顯微成巖縫(Ⅲ級)連通中小孔隙,改善孔隙連通網(wǎng)絡(luò),提高天然氣運(yùn)移充注效率;納米級基質(zhì)裂隙(Ⅳ級)溝通粒內(nèi)微孔隙,擴(kuò)大儲集空間,增加儲量規(guī)模。Ⅰ級與Ⅱ級構(gòu)造成因裂縫主要發(fā)育有3期,其中早期和中期裂縫主要為半充填—充填,是油氣大規(guī)模充注前的上新世早期以前形成,晚期開啟裂縫與油氣大規(guī)模充注同期或略晚,形成于上新世末期之后。裂縫網(wǎng)絡(luò)對孔隙度貢獻(xiàn)率較低,但在平行裂縫走向上,裂縫可以提高滲透率2~3個數(shù)量級。
[Abstract]:Taking the deep Cretaceous sandstone reservoir of Bashiqike formation in Kuqa Foreland thrust belt as an example, using the data of surface outcrop, core, thin slice and imaging logging, using industrial CTs, laser confocal, cathodoluminescence, electron probe, etc. By means of scanning electron microscope and other technical means, the fractures are classified and classified on the basis of fracture opening, and the types, characteristics, origin, stages and formation sequences of natural fractures in sandstone reservoir of Kuqa Foreland thrust belt are systematically studied. The natural fractures in the deep tight sandstone reservoir of Kuqa Foreland thrust belt can be divided into 4 levels: the macroscopic structural fractures (class I) of more than 100 micron size cut the single sand body and form the dominant migration channel. Increasing reservoir permeability; cutting matrix particles with 10 micron to 100 micron microstructures associated fractures (class 鈪，

本文編號：1502760