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摘要? 滲透率是衡量巖石允許流體通過的暢通程度的參數(shù),，是反映儲層滲流特性進(jìn)行儲層評價(jià)的關(guān)鍵參數(shù)之一。鄂爾多斯盆地中南部地區(qū)長 6 致密砂巖儲層由于受沉積環(huán)境,、成巖作用和構(gòu)造因素的綜合影響,，孔隙結(jié)構(gòu)復(fù)雜、非均質(zhì)性強(qiáng),。巖心孔滲實(shí)驗(yàn)數(shù)據(jù)中,，相同孔隙度數(shù)值的巖心滲透率數(shù)值相差 1 至 2 個(gè)數(shù)量級，利用常規(guī)解釋方法進(jìn)行滲透率解釋精度較低,，不能滿足儲層評價(jià)要求,。本論文運(yùn)用FZI累積頻率劃分方法將研究區(qū)儲層劃分為 4 類，分類后的四類儲層孔隙度,、滲透性差異明顯,，且每一類儲層孔隙結(jié)構(gòu)、滲透性等特征基本一致,，說明利用 FZI值劃分儲層類型的合理性,。在此基礎(chǔ)上建立了各類儲層的滲透率精細(xì)解釋模型，利用多元線性回歸建模方法建立孔隙度,、FZI的測井響應(yīng)多參數(shù)擬合方程,，實(shí)現(xiàn)了FZI的連續(xù)定量評價(jià)，實(shí)現(xiàn)了研究區(qū)致密儲層流動單元類型的連續(xù)劃分及其滲透率的測井評價(jià),；并將其應(yīng)用于研究區(qū)典型單井的滲透率計(jì)算中,，應(yīng)用結(jié)果表明：新方法計(jì)算滲透率與巖心分析數(shù)據(jù)吻合較好,，該方法有效地提高了滲透率測井評價(jià)的準(zhǔn)確度,。該研究對于精確預(yù)測該研究區(qū)長 6 致密砂巖儲層滲透率的空間分布和陸相致密砂巖儲層滲透率的詳細(xì)評價(jià)提供理論依據(jù),。

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關(guān)鍵詞 ：滲透率,；孔隙度；流動單元,；測井曲線,；延長組；致密儲層,；鄂爾多斯盆地

Abstract：

Permeability is a measure of the ability of a porous rock to allow fluids to pass through it. It is one of the key

parameters for reservoir evaluation to reflect the characteristics of reservoir seepage. Due to the comprehensive influence of

sedimentary environment, diagenesis and tectonic factors, the tight sandstone reservoirs of the Upper Triassic Chang 6 member

in the central-southern Ordos Basin have a complex pore structure and strong heterogeneity. In the core porosity and permeability

test data, the core permeability values of the same porosity value differ by one to two orders of magnitude. Permeability

prediction with methods used for conventional reservoirs cannot meet the requirements of unconventional reservoir evaluation.

Hence, this study divided the Chang 6 reservoir into four types of flow units using the Flow Zone Indicator ( FZI ) cumulative

frequency division method. The porosity and permeability of the four types of reservoirs after classification are obviously

different, and the characteristics of the pore structure and permeability of each type of reservoir are basically the same. On this

basis, a fine interpretation model for permeability of various reservoirs was established, and a multi-parameter fitting equation for

porosity and FZI logging response was established by using multiple linear regression modeling methods to achieve continuous

quantitative evaluation of FZI and to realize the continuous division of flow unit types in tight reservoirs in the area and the

logging evaluation of permeability; and we applied it to the permeability calculation of typical single wells in the study area.

The application results show that the new method calculates permeability which is in good agreement with the core analysis

data .This method effectively improves the accuracy of permeability logging evaluation. This research is of great significance

for accurately predicting the spatial distribution of permeability of Chang 6 tight sandstone reservoirs in the study area, and will

provide a theoretical basis for the detailed evaluation of the permeability of continental tight sandstone reservoirs.

Key words： permeability; porosity; flow unit; log interpretation; Yanchang Formation tight reservoir; Ordos Basin

收稿日期: 2021-09-29 ????

PACS:

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基金資助:中國石油大學(xué)( 北京) 優(yōu)秀青年學(xué)者科研啟動基金項(xiàng)目(2462020QNXZ004),、國家科技重大專項(xiàng)“中生界陸相不同盆地類型頁巖氣賦存方式
與富集規(guī)律研究”(2016ZX05034001-005) 和國家科技重大專項(xiàng)“頁巖氣成藏要素匹配及綜合評價(jià)”(2017ZX05035002-007)、中石油戰(zhàn)略
合作科技專項(xiàng)(ZLZX2020-01-06-02) 聯(lián)合資助

通訊作者: [email protected]

引用本文: ??

魯健康, 郝彬, 李程善, 王維斌, 王乾右, 楊威. 基于流動單元分類的致密砂巖儲層滲透率預(yù)測. 石油科學(xué)通報(bào), 2021, 03: 369-379 LU Jiankang, HAO Bin, LI Chenshan, WANG Weibin, WANG Qianyou, YANG Wei. Permeability prediction of tight sandstone reservoirs based on flow unit classification. Petroleum Science Bulletin, 2021, 03: 369-379.

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