【摘要】：鄂爾多斯盆地姬塬地區(qū)延長組長2段發(fā)現(xiàn)一些油井,但油層電阻率較低,難以識別,且不同區(qū)塊石油富集程度存在差異,長2低阻油層分布及成藏控制因素不詳。論文在油層低阻成因分析的基礎(chǔ)上,結(jié)合前人低阻識別方面的研究成果,建立研究區(qū)長2低阻油井識別圖版,明確研究區(qū)長2低阻油井的平面分布,并通過油源對比和石油運聚特征分析,總結(jié)研究區(qū)長2油層成藏控制因素。 研究區(qū)長2油水層電阻率對比表明：研究區(qū)長2段油層電阻率絕對值和電阻增大率普遍較低,且電阻率在平面上分布無規(guī)律；長2油層低阻主要受高地層水礦化度和高束縛水飽和度的影響,而與導(dǎo)電礦物含量及淡水泥漿的侵入無關(guān)；此外,碎屑顆粒粒度偏細(xì)、孔隙結(jié)構(gòu)復(fù)雜、黏土礦物含量及其陽離子附加導(dǎo)電性對研究區(qū)長2油層低阻也有一定的影響。 通過對研究區(qū)長2段油層低阻成因分析,建立了用侵入因子與電阻率交匯圖以及侵入因子與聲波時差值的交匯圖來識別研究區(qū)長2段低阻油層的識別圖版；明確了研究區(qū)平面上長2低阻油井的分布。 研究區(qū)長2段石油三降藿烷參數(shù)Ts/Tm大于1,重排甾烷豐度較高,與下伏延長組長7段烴源巖抽提物三降藿烷參數(shù)特征相似,而與延長組長6及長4+5特征不同,但三降藿烷參數(shù)Ts/Tm的比值及重排甾烷含量較長7段源巖抽提物低,表明：研究區(qū)長2段石油主要來自于其下伏長7段烴源巖,但同時還存在長6段及長4+5段源巖產(chǎn)物的混和。 研究區(qū)長2段下伏層位中局部發(fā)育的裂縫系統(tǒng)及垂向疊置的砂體是研究區(qū)延長組長7源巖生成產(chǎn)物向上運聚的通道；長7段烴源巖生成的石油沿輸導(dǎo)體系運移至長2段儲層的過程中,以垂向運移為主,并在長2段低滲透砂體中發(fā)生局部小規(guī)模的側(cè)向運移；長7源巖層段的異常壓力是烴源巖生成產(chǎn)物沿裂縫及垂向疊置砂體向上運移的動力,而浮力是石油在長2儲層內(nèi)部發(fā)生小范圍側(cè)向運聚的動力。 研究區(qū)長2低阻油層成藏受烴源巖分布、垂向上發(fā)育的裂縫系統(tǒng)、單斜背景下鼻狀隆起和儲層滲透率的控制。
[Abstract]:Some oil wells were found in the second member of Yanchang formation in Jiyuan area, Ordos Basin, but the resistivity of reservoir is low, it is difficult to identify, and the degree of oil enrichment is different in different blocks. The distribution of Chang2 low resistivity reservoir and the controlling factors of reservoir formation are unknown. Based on the analysis of the formation cause of low resistivity in oil reservoir and the research results of previous research on low resistivity identification, the recognition chart of Chang2 low resistivity oil well in the research area is established, and the plane distribution of the low resistivity oil well in the study area is determined. Through oil source correlation and oil migration and accumulation analysis, the controlling factors of reservoir formation in Chang2 reservoir are summarized. The comparison of resistivity of Chang2 oil-water layer in the study area shows that the absolute value of resistivity and the increase rate of resistance are generally lower and the resistivity distribution is irregular in the plane. The low resistivity of Chang2 reservoir is mainly affected by the water salinity and high irreducible water saturation in the highland layer, but not by the content of conductive minerals and the invasion of fresh water mud, in addition, the grain size of clastic particles is thin and the pore structure is complex. The content of clay and the additional conductivity of cations also have some effects on the low resistivity of Chang2 reservoir in the study area. Based on the analysis of the formation causes of the low resistivity of the Chang-2 formation in the study area, the identification chart of the low resistivity reservoir in the study area is established by using the intersection map of the invasion factor and the resistivity, and the intersection diagram of the invasion factor and the acoustic time difference value to identify the low resistivity oil layer of the Chang-2 formation in the study area. The distribution of 2 long and low resistivity wells on the plane of the study area is determined. In the study area, the Ts/Tm of the second member of the study area is greater than 1, and the abundance of the rearrangement sterane is higher, which is similar to that of the source rock extract of the lower Changchang formation, but is different from the characteristics of the Chang 6 and Chang 45. However, the ratio of Ts/Tm and the content of rearrangement sterane are lower than those of the source rocks of the Chang2 formation, which indicates that the source rocks of the Chang2 formation mainly come from the source rocks of the Lower Changchang formation, but at the same time there is a mixture of the source rock products of the Chang 6 member and the Chang 45 member. The fracture system developed locally in the underlying bed of the Chang-2 formation and the vertical overlay sand body are the channels for the upward migration and accumulation of the products of the source rocks in the Chang 7 formation of the study area. In the process of oil migration from source rock of Chang7 formation to Chang 2 reservoir, vertical migration is dominant, and local small-scale lateral migration occurs in low permeability sand body of Chang 2 member. The abnormal pressure in source rock formation of Chang 7 is the driving force of hydrocarbon source rock generation products moving upward along fractures and vertical superimposed sand bodies, while buoyancy is the power of lateral migration and accumulation of oil in a small range in Chang 2 reservoir. Reservoir formation in Chang2 low resistivity reservoir is controlled by source rock distribution, vertical fracture system, nasal uplift and reservoir permeability in monoclinic background.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 韓濟全;用孔隙度與含水飽和度交會圖識別儲層流體性質(zhì)[J];勘探地球物理進(jìn)展;2005年04期

2 禚喜準(zhǔn);王琪;史基安;;鄂爾多斯盆地鹽池-姬塬地區(qū)三疊系長2砂巖成巖演化特征與優(yōu)質(zhì)儲層分布[J];礦物巖石;2005年04期

3 任軍虎;王萬春;康晏;;有機地球化學(xué)指標(biāo)的分析[J];礦物巖石地球化學(xué)通報;2006年03期

4 付金華;李士祥;劉顯陽;楊時雨;羅安湘;惠瀟;;鄂爾多斯盆地姬塬大油田多層系復(fù)合成藏機理及勘探意義[J];中國石油勘探;2013年05期

5 杜金虎;何海清;楊濤;李建忠;黃福喜;郭彬程;閆偉鵬;;中國致密油勘探進(jìn)展及面臨的挑戰(zhàn)[J];中國石油勘探;2014年01期

6 李長喜;歐陽健;周燦燦;修立軍;;淡水鉆井液侵入油層形成低電阻率環(huán)帶的綜合研究與應(yīng)用分析[J];石油勘探與開發(fā);2005年06期

7 張文正;楊華;李劍鋒;馬軍;;論鄂爾多斯盆地長_7段優(yōu)質(zhì)油源巖在低滲透油氣成藏富集中的主導(dǎo)作用——強生排烴特征及機理分析[J];石油勘探與開發(fā);2006年03期

8 田中元;蔣阿明;閆偉林;劉英明;郭雙生;;基于隨鉆和電纜測井電阻率的鉆井液侵入校正方法——以阿曼DLL油田高孔低滲碳酸鹽巖油藏為例[J];石油勘探與開發(fā);2010年04期

9 李長喜;石玉江;周燦燦;李霞;劉炳玉;唐良民;李樹晶;;淡水鉆井液侵入低幅度-低電阻率油層評價方法[J];石油勘探與開發(fā);2010年06期

10 高劍波;龐雄奇;王志欣;姜振學(xué);丁保來;席勝利;;鄂爾多斯盆地姬塬地區(qū)延長組碎屑巖儲層低滲特征及含油性主控因素[J];中國石油大學(xué)學(xué)報(自然科學(xué)版);2007年01期

，

本文編號：2271920