致密油評(píng)價(jià)新方法及其應(yīng)用——以鄂爾多斯盆地延長(zhǎng)組長(zhǎng)7段致密油為例

致密油評(píng)價(jià)新方法及其應(yīng)用
——以鄂爾多斯盆地延長(zhǎng)組長(zhǎng)7段致密油為例

王明磊，張福東，關(guān)輝，李君，楊慎，佘源琦，邵麗艷

(中國(guó)石油勘探開發(fā)研究院廊坊分院，河北廊坊 065007)

摘要：利用高分辨率場(chǎng)發(fā)射掃描電子顯微鏡、微米及納米級(jí)CT掃描、恒速壓汞及核磁共振等先進(jìn)技術(shù)方法，對(duì)鄂爾多斯盆地延長(zhǎng)組長(zhǎng)7段致密油儲(chǔ)層微觀孔喉結(jié)構(gòu)特征及致密油賦存狀態(tài)進(jìn)行定量深入研究。首先對(duì)致密油賦存的微觀孔隙結(jié)構(gòu)進(jìn)行分析，認(rèn)為孔隙大小決定致密油儲(chǔ)層的儲(chǔ)集能力，喉道大小是儲(chǔ)層物性主要制約因素。長(zhǎng)7段致密油儲(chǔ)層孔隙平均半徑為10～15μm，喉道半徑主要分布范圍為0.3～0.9μm；其中半徑為0.1～0.5μm的喉道控制了儲(chǔ)層中60%的可動(dòng)流體；并建立了孔隙、喉道及孔喉配置結(jié)構(gòu)三維立體模型。定量評(píng)價(jià)致密油微觀賦存狀態(tài)，將其分為乳狀、簇狀、喉道狀、顆粒狀、薄膜狀及孤立狀6種賦存狀態(tài)，定量測(cè)得儲(chǔ)層中致密油以乳狀和薄膜狀為主要賦存狀態(tài)，占致密油總量的70%以上。致密油賦存狀態(tài)的定量研究，為科學(xué)開展致密油儲(chǔ)層評(píng)價(jià)及實(shí)現(xiàn)致密油有效動(dòng)用提供可靠依據(jù)。

關(guān)鍵詞：致密油；孔喉結(jié)構(gòu)；賦存狀態(tài)；定量研究；鄂爾多斯盆地

中圖分類號(hào)：TE135

作者簡(jiǎn)介：第一王明磊(1981年生)， 男，博士，工程師，2009 年畢業(yè)于西南石油大學(xué)，從事于石油天然氣綜合研究工作。郵箱：wml69@petrochina.com.cn。

New Tight Oil Evaluation Technology and Its Application—A Case Study of Chang7

Tight Oil Reservoir in Yanchang Formation, Ordos Basin

Wang Minglei, Zhang Fudong, Guan Hui, Li Jun, Yang Shen, She Yuanqi, Shao Liyan

(ResearchInstituteofPetroleumExplorationandDevelopment-LangfangBranch,Langfang,Hebei065007,China)

Abstract:Using the technology of leading field emission scanning electron microscope, micro-nano grade CT scanning technology, the technology of constant pressure mercury, the nuclear magnetic resonance technology, and other advanced technology, quantitative research was done about the reservoir pore-throat and tight oil occurrence state of Yanchang tight oil reservoir of Yanchang Formation in Ordos Basin. First of all, the micro-pore structure of tight oil in the reservoir was analyzed. It was believed that pore size determined tight oil reservoir capacity, and the size of pore throat was a main factor restricting reservoir property. The radius of porosity was around 10μm to 15μm, throats distribute between 0.3μm and 0.5μm, and the throats of the range 0.1μm and 0.5μm controlled 60% of movable fluid of reservoir. And 3D models of pore, throat and pore-throat structure were established. On the basis of quantitative evaluation of micro occurrence state, tight oil was divided into six types, i.e. thin film form, cluster form, throat form, emulsion form, particle form and isolated form. Emulsion form and thin film form were main types, and the content of emulsion form and thin film form accounted for about 70% of total. Quantitative research on micro occurrence state provided a reliable basis for evaluating tight oil reservoir and making effective use of tight oil.

Key words: tight oil; pore-throat structure; occurrence state; quantitative research; Ordos Basin

致密油是繼頁(yè)巖氣之后全球非常規(guī)油氣勘探開發(fā)的又一新熱點(diǎn)[1-4]，被石油工業(yè)界譽(yù)為“黑金”[5]。近年來(lái)我國(guó)加大對(duì)致密油儲(chǔ)層、成藏等方面研究力度，已經(jīng)掌握了致密油儲(chǔ)層的巖性、物性等基本特征，但在致密油儲(chǔ)層微觀孔喉結(jié)構(gòu)表征方面仍存在諸多難題，更未對(duì)致密油微觀賦存狀態(tài)進(jìn)行定量評(píng)價(jià)。……