【摘要】：廊固凹陷是冀中凹陷最北部的含油氣凹陷,勘探程度較高,目前主要的勘探對象為中深層的隱蔽性油氣藏。然而中深層儲層非均質(zhì)性強,油氣分布規(guī)律錯綜復雜,造成油氣勘探難度增強、風險增加。本論文以油氣儲層地質(zhì)學相關(guān)的基礎(chǔ)理論為指導,運用巖心觀察、薄片鑒定及圖像分析、壓汞資料、測錄井資料、流體包裹體分析等技術(shù)手段,并結(jié)合前人的研究成果,對廊固凹陷古近系沙河街組儲層(重點是沙三段、沙四上亞段深度大于2000m)儲層特征進行了一定的研究,包括巖石學特征、物性特征、孔喉結(jié)構(gòu)特征、儲層空間展布情況、控制因素等。廊固凹陷古近系沙河街組中深層儲層,巖石類型以長石砂巖、巖屑長石砂巖和長石質(zhì)巖屑砂巖為主。碎屑成熟度為低成分成熟度,中等結(jié)構(gòu)成熟度。儲層孔隙間膠結(jié)物類型多、含量中等,碳酸鹽礦物中以方解石膠結(jié)為主,自生黏土礦物以高嶺石為主。不同構(gòu)造帶填隙物具體含量有所差異。研究區(qū)目的層孔隙度類型以中孔-低孔為主,滲透率類型以特低滲-超低滲居多。從構(gòu)造帶上看,柳泉—曹家務(wù)洼槽帶儲層物性相較另外兩個構(gòu)造帶更好;從層位上比較,沙三段儲層物性整體上好于沙四上亞段。整個凹陷沙河街組儲層縱向上共發(fā)育有3個異常高孔帶,深度分別為2400~2600m、2750~3250m和3800~4500m。根據(jù)已有的實測物性資料、測井資料、壓汞測試資料綜合研究,結(jié)合國內(nèi)碎屑巖儲層孔隙度和滲透率類型劃分標準,將廊固凹陷古近系沙河街組中深層儲層分為Ⅰ類、Ⅱ類(Ⅱa、Ⅱb)、Ⅲ類、Ⅳ類,儲層物性依次變差。研究區(qū)沙四上亞段儲層級別以Ⅲ類、Ⅳ類儲層為主,沙三下亞段儲層以Ⅱb、Ⅲ類儲層為主,沙三中亞段儲層以Ⅱb、Ⅲ類儲層為主,也有少量Ⅰ類、Ⅱa類儲層發(fā)育。優(yōu)質(zhì)儲層主要發(fā)育在湖底扇相、辮狀河三角洲前緣水下分流河道砂、濱淺湖灘壩砂體。廊固凹陷古近系沙河街組中深層儲層發(fā)育受沉積因素、成巖作用、構(gòu)造作用、烴類充注、異常高壓等因素的共同控制。其中沉積作用控制砂體發(fā)育;成巖演化作用過程與儲層孔隙演化存在耦合關(guān)系;構(gòu)造作用下產(chǎn)生的裂縫改善了儲層的運輸通道,巖漿活動的烘烤疊加效應使生油門限上移,促使油氣生成;早期烴類充注減緩了自生礦物的形成和礦物間的交代作用,并且抑制了晚期碳酸鹽膠結(jié)物的充填,從而保護了原生孔隙,對儲層物性演化起到積極作用;異常高壓的發(fā)育主要保護和改造了儲層物性。綜合沉積因素、儲層物性特征和目前的勘探進展對廊固凹陷沙三段、沙四上亞段中深層儲層有利區(qū)帶進行了預測。
[Abstract]:Langgu sag is the northernmost oil-bearing sag in Jizhong sag, which has a high exploration degree. At present, the main exploration object is the hidden oil and gas reservoir in the middle and deep layers. However, the heterogeneity of middle and deep reservoirs and the complexity of oil and gas distribution make the exploration of oil and gas more difficult and riskier. Guided by the basic theory of oil and gas reservoir geology, this paper uses core observation, thin slice identification and image analysis, mercury injection data, logging data, fluid inclusion analysis and other technical means, and combines the previous research results. The reservoir characteristics of the Paleogene Shahejie formation in the Langgu depression are studied, including petrology, physical properties, pore throat structure and reservoir spatial distribution. Control factors, etc. The middle and deep reservoirs of Shahejie formation of Paleogene in Langgu depression are mainly composed of feldspathic sandstone, lithic feldspathic sandstone and feldspathic lithic sandstone. The detrital maturity is low composition maturity and medium structure maturity. There are many types of interpore cementation and medium content in reservoir. Calcite cementation is dominant in carbonate minerals and kaolinite is dominant in authigenic clay. The specific contents of interstitial materials in different tectonic zones are different. In the study area, the porosity types of the target layer are mainly mesoporous and low porosity, while the permeability types are mainly ultralow permeability and ultra low permeability. From the structural belt, the reservoir physical properties of Liuquan-Cao Zaozhouwa trough belt are better than those of the other two structural zones, and the reservoir physical properties of the third member of Sha 3 are better than that of the upper submember of Sha 4 on the whole. There are three abnormal high porosity zones in the reservoir of Shahejie formation in the whole sag, the depth of which is 2400 ~ 2600m ~ 2750m ~ 3250m and 3800N ~ 4500m respectively. According to the existing physical property data, well logging data and mercury injection test data, combined with the classification standard of porosity and permeability of clastic rock reservoirs in China, the middle and deep reservoirs of Shahejie formation of Paleogene in Langgu depression are classified into class 鈪，

本文編號：2297891