志丹油田北塔區(qū)塊長(zhǎng)6油層組油藏描述
發(fā)布時(shí)間:2019-05-17 20:41
【摘要】:本文基于鄂爾多斯盆地三疊系延長(zhǎng)組地層研究成果,運(yùn)用石油地質(zhì)學(xué)、沉積學(xué)、地層層序?qū)W理論,按照標(biāo)志層、標(biāo)準(zhǔn)層、旋回對(duì)比、地層厚度等原則,完成了工區(qū)的地層精細(xì)劃分與對(duì)比,將長(zhǎng)6油層組進(jìn)一步細(xì)分為長(zhǎng)61、長(zhǎng)62、長(zhǎng)63和長(zhǎng)64四個(gè)油層亞組,其中長(zhǎng)61細(xì)分為長(zhǎng)61-1、長(zhǎng)61-2,長(zhǎng)62細(xì)分為長(zhǎng)62-1、長(zhǎng)62-2、長(zhǎng)62-3,長(zhǎng)63細(xì)分為長(zhǎng)63-1、長(zhǎng)63-2。在此基礎(chǔ)上,研究了工區(qū)長(zhǎng)6油層組的構(gòu)造特征,各小層的構(gòu)造形態(tài)自下而上具明顯的繼承性,為平緩的西傾單斜,局部發(fā)育鼻狀微幅構(gòu)造,對(duì)油氣富集具有一定的控制作用。通過(guò)觀察巖心、沉積相標(biāo)志識(shí)別、測(cè)井相分析,結(jié)合區(qū)域沉積背景,工區(qū)長(zhǎng)6油層組主要發(fā)育三角洲前緣亞相沉積模式,識(shí)別出水下分流河道、分流間灣、水下分流河道側(cè)翼、河口砂壩、席狀砂等5種沉積微相類型,且沉積相帶和砂體總體呈北東-南西向條帶狀展布,分流河道之間被分流間灣分隔。長(zhǎng)6油層組巖石類型主要為長(zhǎng)石砂巖,碎屑顆粒主要是長(zhǎng)石、石英,具有較低的成分成熟度,屬于低~特低孔、特低~超低滲儲(chǔ)層,孔隙類型以粒間溶孔為主,晶間微孔次之,喉道類型主要為細(xì)喉型,次為微細(xì)喉和微喉,屬小孔-細(xì)喉型。綜合儲(chǔ)層巖石類型、沉積相、成巖作用、儲(chǔ)層物性、砂體厚度、微觀孔隙結(jié)構(gòu)特征、毛管壓力曲線特征等,本區(qū)長(zhǎng)6儲(chǔ)層歸為Ⅲa~Ⅳb類,其中Ⅲa類為好儲(chǔ)層,Ⅲb類為較好儲(chǔ)層,Ⅳ。類為中等儲(chǔ)層,Ⅳb類為差儲(chǔ)層。工區(qū)長(zhǎng)6有效儲(chǔ)層巖性下限為細(xì)砂巖級(jí)、含油級(jí)下限為油斑、物性下限為9.0%(孔隙度)和0.2×10-3μm2(滲透率)、電性下限為含油飽和度≥40%、4.0電阻≥18Ω·m和聲波時(shí)差≥218μs/m。用容積法計(jì)算的工區(qū)長(zhǎng)6石油地質(zhì)儲(chǔ)量為1061.42x104t,含油面積18.80km2。
[Abstract]:Based on the research results of Triassic Yanchang formation in Ordos Basin, this paper applies the theories of petroleum geology, sedimentology and stratigraphy, according to the principles of marker layer, standard layer, cycle correlation, formation thickness and so on. The formation fine division and correlation of the working area have been completed, and the Chang 6 reservoir formation has been further subdivided into four oil layer subformations: Chang 61, Chang 62, Chang 63 and Chang 64, of which Chang 61 is divided into long 61 鈮,
本文編號(hào):2479389
[Abstract]:Based on the research results of Triassic Yanchang formation in Ordos Basin, this paper applies the theories of petroleum geology, sedimentology and stratigraphy, according to the principles of marker layer, standard layer, cycle correlation, formation thickness and so on. The formation fine division and correlation of the working area have been completed, and the Chang 6 reservoir formation has been further subdivided into four oil layer subformations: Chang 61, Chang 62, Chang 63 and Chang 64, of which Chang 61 is divided into long 61 鈮,
本文編號(hào):2479389
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