【摘要】：三塘湖盆地屬阿爾泰山山系和天山山系之間的疊合、改造型山間盆地,呈北西-南東向狹長(zhǎng)狀分布,面積約2.3×104km2。根據(jù)構(gòu)造、沉積組合等特征,將盆地分為東北沖斷隆起帶、中央坳陷帶和西南逆沖推覆帶三個(gè)一級(jí)構(gòu)造單元。馬北區(qū)塊位于三塘湖油田牛圈湖區(qū)塊的東部、牛東油田的西部,構(gòu)造位置位于三塘湖盆地條山隆起帶前緣的牛圈湖—牛東構(gòu)造帶上。馬北區(qū)塊由湖219井和馬46井兩個(gè)區(qū)塊組成�？偤兔娣e12.85km2,探明地質(zhì)儲(chǔ)量1230×104t。目的層為侏羅系中統(tǒng)西山窯組,油藏埋深湖219井區(qū)為1200~1800m,馬46井區(qū)為769~1172m。儲(chǔ)層沉積類型為辮狀河三角洲前緣水下分流河道沉積,儲(chǔ)層巖性主要為長(zhǎng)石巖屑砂巖,儲(chǔ)層物性差,平均孔隙度15.5%,滲透率9.45×10-3μm2,非均質(zhì)性強(qiáng)。油層單層厚度為2~12m,最厚17.6m,油藏類型屬層狀構(gòu)造巖性油藏。油藏溫度、壓力低,溫度梯度2.3℃/100m,壓力系數(shù)0.71~0.83;馬北區(qū)塊湖219井、馬46井區(qū)原油屬稠油,粘度67~2443mPa·s。此次研究首先對(duì)該區(qū)塊進(jìn)行了目標(biāo)層位的地震解釋和儲(chǔ)層反演,從而對(duì)構(gòu)造進(jìn)行了重新認(rèn)識(shí)并且對(duì)目的層進(jìn)行了小層劃分,并且進(jìn)行了目的層段的四性關(guān)系研究,并重新進(jìn)行了儲(chǔ)量計(jì)算。通過(guò)對(duì)油藏特征的初步認(rèn)識(shí),進(jìn)行了水平井先導(dǎo)試驗(yàn),通過(guò)水平井地質(zhì)導(dǎo)向及目的層取芯等手段獲取了目的層的重要資料,進(jìn)行了地質(zhì)特征再認(rèn)識(shí)及儲(chǔ)量復(fù)算。并且進(jìn)行了馬平23-35井和馬試5井蒸汽吞吐試驗(yàn),得出馬46井區(qū)儲(chǔ)層滲透率低,吸汽能力差,含油飽和度低,可動(dòng)油數(shù)量有限的結(jié)論。
[Abstract]:The Santanghu basin belongs to the overlap between the Altai and Tianshan mountains. The reformed intermountain basin is distributed in a long, narrow and narrow direction from the north to the south with an area of about 2.3 脳 10 ~ 4km ~ (2). According to the characteristics of structure and sedimentary assemblage, the basin is divided into three first-order tectonic units: the thrust uplift belt in northeast China, the central depression belt and the southwest thrust nappe belt. The Mabei block is located in the eastern part of Niuquan Lake block in Santanghu Oilfield and in the west of Niudong Oilfield. The tectonic location is located in the Niuquanhu-Niudong structural belt in the front edge of Tiaoshan uplift belt in Santanghu Basin. Mabei block is composed of two blocks, Hu 219 well and Ma 46 well. The total oil-bearing area is 12.85 km2, and the proved geological reserves are 1230 脳 10 ~ 4 t. The target layer is the Xishanyao formation of the Jurassic Middle Series, the buried deep lake 219 well area is 1200 ~ 1800m, and the Ma 46 well area is 769 ~ 1172m. Reservoir sedimentary type is braided river delta front underwater distributary channel deposition, reservoir lithology is mainly feldspar lithic sandstone, reservoir physical property is poor, average porosity is 15.5am, permeability is 9.45 脳 10 ~ (-3) 渭 m ~ (2), heterogeneity is strong. The single layer thickness of oil layer is 2 ~ 12 m and the thickest is 17.6 m. The reservoir type belongs to stratified structural lithologic reservoir. The reservoir temperature and pressure are low, the temperature gradient is 2.3 鈩，

本文編號(hào)：2140922