張義楷，康　安，閔小剛，李志明，李偉超，高慧君

(中國(guó)海洋石油國(guó)際有限公司 中國(guó)海油伊拉克有限公司，北京　100028)

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張義楷，康安，閔小剛，李志明，李偉超，高慧君

(中國(guó)海洋石油國(guó)際有限公司 中國(guó)海油伊拉克有限公司，北京100028)

摘要：以巖心、錄井、測(cè)井、地震及相關(guān)生產(chǎn)資料為基礎(chǔ)，對(duì)伊拉克米桑(Missan)油田群Mishrif組段儲(chǔ)層特征及其成因進(jìn)行分析。結(jié)果表明，Mishrif組段儲(chǔ)層沉積環(huán)境屬于碳酸鹽巖開(kāi)闊臺(tái)地，發(fā)育有臺(tái)內(nèi)灘、臺(tái)內(nèi)礁和開(kāi)闊潮下亞相。巖石類(lèi)型主要有生物礁灰?guī)r、生屑顆?；?guī)r、生屑似球粒顆粒灰?guī)r及生屑似球粒泥?；?guī)r。儲(chǔ)集空間類(lèi)型主要為原生粒間孔、次生粒間溶孔、鑄模孔、基質(zhì)微孔及少量小型溶蝕孔洞和微裂縫。受沉積作用和成巖作用控制，儲(chǔ)層橫向分布相對(duì)穩(wěn)定，但縱向物性變化較大、層內(nèi)非均質(zhì)性嚴(yán)重，是制約原油采出程度的關(guān)鍵因素。

關(guān)鍵詞：非均質(zhì)性；沉積相；成巖作用；碳酸鹽巖儲(chǔ)層；Mishrif組；米桑油田群; 伊拉克

1油田群概況及地質(zhì)背景

米桑(Missan)油田群位于伊拉克東南部米桑省[1]，毗鄰伊朗邊界，西北距巴格達(dá)約350 km，南距巴士拉約175 km(圖1)。油田群共包括3個(gè)油田，分別是Abu Ghirab，Buzurgan和Fauqi油田。受區(qū)域構(gòu)造控制[2]，米桑構(gòu)造區(qū)總體表現(xiàn)為北西—南東向的背斜構(gòu)造，共發(fā)育東、西2個(gè)背斜構(gòu)造帶。其中Abu Ghirab油田、Fauqi油田位于東背斜構(gòu)造帶，Buzurgan油田位于西背斜構(gòu)造帶。

圖1　伊拉克米桑油田群地理位置示意

2儲(chǔ)層特征

2.1巖石和儲(chǔ)集空間類(lèi)型

儲(chǔ)層儲(chǔ)集空間類(lèi)型主要有原生粒間孔、次生粒間溶孔、鑄?？住⒒|(zhì)微孔及少量小型溶蝕孔洞和微裂縫。其中生物礁灰?guī)r、生屑顆?；?guī)r和生屑似球粒顆?；?guī)r中主要發(fā)育原生粒間孔、次生粒間溶孔、粒內(nèi)孔和少量溶蝕孔洞。生屑似球粒泥?；?guī)r中主要發(fā)育鑄?？?、次生粒間溶孔和基質(zhì)微孔(圖3)。

圖2　伊拉克米桑油田群Mishrif組沉積與層序特征

圖3　伊拉克米桑油田群Mishrif組段儲(chǔ)層孔隙類(lèi)型

Rud.厚殼蛤碎屑；For.有孔蟲(chóng)屑；Ech.棘皮屑；Gpd.腹孔蟲(chóng)屑；Cc.灰質(zhì)膠結(jié)；Ig.原生粒間孔；Dp.次生粒間溶孔；Pel.似球粒；

Mtx.基質(zhì)；Dol-C.白云質(zhì)膠結(jié)

2.2沉積相及其特征

圖4　伊拉克米桑油田群B-X1井Mishrif組

2.3儲(chǔ)層物性和非均質(zhì)性

表1　伊拉克米桑油田群Mishrif 組

注：表中分式含義為：最小值～最大值/平均值(樣品數(shù))。

圖5　伊拉克米桑油田群Buzurgan油田

圖6　伊拉克米桑油田群B-X2井Mishrif組段產(chǎn)液剖面

3儲(chǔ)層發(fā)育主控因素

3.1沉積作用

同時(shí)由于微地貌的起伏，在微地貌高地，為礁灘相沉積的有利區(qū)，發(fā)育物性相對(duì)較好的礁灰?guī)r或顆?；?guī)r儲(chǔ)層，而在相對(duì)低地則以灘間或開(kāi)闊潮下環(huán)境的泥?；?guī)r發(fā)育為特征，儲(chǔ)層物性相對(duì)較差。

3.2成巖作用

3.3構(gòu)造作用

構(gòu)造作用對(duì)儲(chǔ)層的改造主要為微裂縫的發(fā)育[24-26]。雖然在研究區(qū)內(nèi)無(wú)明顯大斷裂發(fā)育，但在多口井的巖心中可觀(guān)察到微裂縫的發(fā)育，鏡下也可見(jiàn)局部發(fā)育開(kāi)啟的有效微裂縫。這些微裂縫的發(fā)育對(duì)儲(chǔ)集空間的貢獻(xiàn)不大，其最為重要的作用是形成滲流通道，改善了局部?jī)?chǔ)層的物性。

4結(jié)論

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(編輯韓彧)

Zhang Yikai, Kang An, Min Xiaogang, Li Zhiming, Li Weichao, Gao Huijun

(CNOOCIraqLimited,CNOOCInternationalLimited,Beijing100028,China)

Abstract:The characteristics and genesis of carbonate reservoirs in the Mishrif member in the Missan oil fields were studied based on core, well logging, seismic and production data. The reservoirs were mainly deposited in a carbonate open platform sedimentary environment, and developed several subfacies such as bioclastic shoals, bioherms and open subtidal deposits. Rudist grainstones, skeletal grainstones, skeletal peloidal grainstones and skeletal peloidal packstones were found. Primary intergranular pores, secondary dissolution pores, mouldic pores, micro-pores associated with matrix, a small quantity of micro-vuggy and micro-fractures provided space for hydrocarbon accumulation. Controlled by deposition and diagenesis, reservoir distribution was similar laterally, but varied obviously vertically and showed a strong heterogeneity, which restricted oil development.

Keywords:heterogeneity; sedimentary facies; diagenesis; carbonate reservoir; Mishrif Formation; Missan oil fields; Iraq

文章編號(hào)：1001-6112(2016)03-0360-06

doi：10.11781/sysydz201603360

收稿日期：2015-08-20；

修訂日期：2016-03-17。

作者簡(jiǎn)介：張義楷(1980—)，男，博士研究生，工程師，從事油氣開(kāi)發(fā)地質(zhì)研究。E-mail:zhangyk2@cnooc.com.cn。

基金項(xiàng)目：國(guó)家科技重大專(zhuān)項(xiàng)(2011ZX05030-005)資助。

中圖分類(lèi)號(hào)：TE122.2

文獻(xiàn)標(biāo)識(shí)碼：A