本文選題：利567井區(qū) + 成巖作用��； 參考：《中國石油大學(華東)》2015年碩士論文

【摘要】：本次論文在對收集的資料綜合分析的基礎(chǔ)上,利用巖心、測井、地震、錄井等資料并充分運用鑄體薄片、普通薄片、掃描電鏡等巖礦分析測試技術(shù),主要對利567井區(qū)沙四上亞段砂礫巖體儲層巖石學特征、成巖作用特征及儲層的性質(zhì)進行了綜合的研究。研究區(qū)沙四上亞段砂礫巖儲層經(jīng)歷了復雜的成巖演化,主要的成巖作用包括壓實作用、膠結(jié)作用、交代作用以及溶解溶蝕等作用。膠結(jié)物的類型主要包括碳酸鹽礦物、石英次生加大、黃鐵礦以及高嶺石、伊利石、綠泥石等粘土礦物。同時根據(jù)自生礦物的分布、組合、演化和形成的順序、粘土礦物的組合以及I/S混層中粘土礦物的轉(zhuǎn)化、巖石中碎屑顆粒的接觸關(guān)系等特征,研究認為研究區(qū)砂礫巖體儲層在埋藏過程中經(jīng)歷了早成巖B階段、中成巖A階段以及中成巖B階段。研究區(qū)沙四上亞段儲層碎屑巖以長石質(zhì)巖屑砂巖和巖屑質(zhì)長石砂巖為主,成分成熟度和結(jié)構(gòu)成熟度均較低�？紫额愋图扔性紫队钟写紊紫丁Ｓ捎诰哂写紊紫栋l(fā)育的各種條件,其粒內(nèi)溶孔、粒間溶孔、鑄�？椎却紊紫栋l(fā)育。同時根據(jù)孔隙度和深度的關(guān)系,研究區(qū)在2850m~3200m發(fā)育在次生孔隙帶。儲層物性主要受到碎屑成分、原始沉積物的結(jié)構(gòu)、粘土雜基含量、自生礦物含量、成巖作用及沉積相的影響。碎屑顆粒中石英的含量與儲層的物性成正相關(guān)關(guān)系,而巖屑的含量則與儲層的物性成負相關(guān)關(guān)系。原始沉積物結(jié)構(gòu)對儲層物性的影響主要表現(xiàn)在粒度中值以及分選性上,通過研究發(fā)現(xiàn)分選性越好儲層的物性越好,而儲層物性隨著粒度中值的增加有變好的趨勢。儲層中粘土雜基含量越高,儲層的儲集物性越差。在成巖作用方面,壓實作用、膠結(jié)作用對降低儲層的孔隙度,使得物性變差,而溶解溶蝕作用則提高儲層的孔隙度,改善儲層的物性。同時在不同的沉積亞相中,扇中亞相儲層物性較好,是油氣儲集的良好場所,而扇根以及扇端的儲油性能相對較差。在對研究區(qū)沙四上亞段砂礫巖體儲層“四性”關(guān)系的綜合研究分析的基礎(chǔ)上,本次研究建立了有效儲層的判別標準,并對砂礫巖體的有效儲層進行了劃分。研究結(jié)果表明,利567井區(qū)沙四上亞段有效儲層的物性標準為:巖性標準為礫狀砂巖以下(主要為礫狀砂巖、含礫砂巖、粗砂巖以及細砂巖),含油標準為油斑以上,儲層的孔隙度要大于等于6.5%,滲透率要大于等于0.9×10-3μm2;而有效儲層的電性標準為聲波時差≥60μs/ft,深感應電阻率≥4.5Ωm。
[Abstract]:On the basis of comprehensive analysis of collected data, this paper makes full use of core, logging, seismic, mud logging and other rock and mineral analysis and testing techniques, such as cast sheet, ordinary slice, scanning electron microscope, etc. The petrological characteristics, diagenesis and reservoir properties of sand-gravel rock reservoirs in the upper submember of Sha 4 in Li567 well area were studied comprehensively. The sandstone and gravel reservoir in the upper part of the study area has undergone complex diagenetic evolution, the main diagenesis includes compaction, cementation, metasomatism and dissolution and so on. The types of cementation mainly include carbonate minerals, quartz secondary augmentation, pyrite, kaolinite, Illite, chlorite and other clay minerals. At the same time, according to the distribution, assemblage, evolution and formation sequence of authigenic minerals, the combination of clay minerals, the transformation of clay minerals in the I / S mixed layer, the contact relationship of clastic particles in rocks, etc. It is considered that the sandstone and gravel reservoir in the study area experienced early diagenesis B stage, middle diagenetic stage A stage and middle diagenetic stage B stage during the burial process. The main clastic rocks in the upper submember of Sha 4 are feldspathic lithic sandstone and lithic feldspathic sandstone with low compositional maturity and structural maturity. Pore types include both primary and secondary pores. Due to various conditions for the development of secondary pores, the secondary pores such as intragranular dissolved pores, intergranular dissolved pores, mold holes, and so on are developed. At the same time, according to the relationship between porosity and depth, the study area developed in the secondary pore zone in 2850m~3200m. The physical properties of reservoirs are mainly affected by clastic composition, structure of primitive sediments, content of clay heterogeneity, contents of authigenic minerals, diagenesis and sedimentary facies. The content of quartz in clastic grain is positively correlated with the physical properties of reservoir, while the content of lithic debris is negatively correlated with the physical property of reservoir. The effect of primary sediment structure on reservoir physical properties is mainly manifested in the grain size median and sorting. It is found that the better the sorting property the better the reservoir physical property and the better the reservoir physical property with the increase of the median particle size. The higher the clay heterogeneity content in the reservoir, the worse the reservoir physical property. In diagenesis, compaction and cementation can decrease the porosity of the reservoir and make the physical property worse, while the dissolution and dissolution can improve the porosity of the reservoir and improve the physical property of the reservoir. At the same time, in different sedimentary subfacies, the reservoir physical property of fan central facies is better, which is a good place for oil and gas reservoir, but the oil storage performance of fan root and fan end is relatively poor. Based on the comprehensive study and analysis of the relationship between the "four properties" of the sand-gravel rock mass reservoir in the upper sub-member of Sha 4 in the study area, the criterion of effective reservoir identification is established and the effective reservoir of the sand-gravel rock mass is divided. The results show that the physical properties of the effective reservoirs in the upper member of Sha-4 in Li567 well area are as follows: the lithologic standard is below the gravel sandstone (mainly gravel sandstone, coarse sandstone and fine sandstone), and the oil content standard is above the oil patch, and the lithologic standard is below the gravel sandstone, the gravelly sandstone, the coarse sandstone and the fine sandstone. The porosity and permeability of the reservoir should be greater than or equal to 6.5 and 0.9 脳 10 ~ (-3) 渭 m ~ (2), while the effective reservoir electrical standard is acoustic moveout 鈮，

本文編號：2056970