徐南肇州區(qū)塊沙河子組沉積、儲層特征研究
發(fā)布時間：2019-01-02 09:46
【摘要】：本次研究遵循層序地層學(xué)理論,從鉆井揭示的地層巖性資料入手,運用測井錄井方法輔助,以地震不整合、上下超截識別為主“井-震結(jié)合”的研究方式將徐家圍子南部沙河子組劃分為由下至上SQ1至SQ1共4個三級層序。通過巖心觀察、粒度分析、測井相分析、地震反射特征分析等研究方法,對徐家圍子南部沙河子組沉積相標(biāo)志進行了總結(jié),在此基礎(chǔ)之上,由單井沉積相分析結(jié)合研究區(qū)層序地層格架控制認(rèn)為研究區(qū)的沉積相類型主要包括扇三角洲、辮狀河三角洲、湖泊相,其中扇三角洲發(fā)育在徐西斷裂控制的西部陡坡帶,辮狀河三角洲發(fā)育在東部緩坡帶。對徐家圍子南部沙河子組儲層物性、薄片、掃描電鏡以及壓汞實驗資料的分析,認(rèn)為沙河子組致密砂巖層巖性主要為巖屑質(zhì)長石砂巖和長石質(zhì)巖屑砂巖,鈣質(zhì)膠結(jié)物與泥質(zhì)雜基構(gòu)成主體填隙物,儲集空間類型為“少見原生孔、多見次生孔、可見微裂縫、偶見晶間孔”的特征。有效儲層的因素可以歸結(jié)為“沉積主控、壓實主導(dǎo)、膠結(jié)增密、溶蝕添孔、裂縫改滲”,壓實作用和膠結(jié)作用通過減小孔隙空間及填充喉道對儲層物性起破壞作用;溶蝕作用通過產(chǎn)生次生溶孔對儲層物性起建設(shè)作用;構(gòu)造活動產(chǎn)生的微裂縫對儲層滲透率起改善作用。平面上,西部扇三角洲前緣亞相為最有利儲層發(fā)育區(qū),東部辮狀河三角洲前緣亞相次之。由于徐家圍子南部沙河子組實測物性數(shù)據(jù)較少,從測井?dāng)M合物性數(shù)據(jù)出發(fā),結(jié)合綜合解釋成果,分別統(tǒng)計徐家圍子南部沙河子組氣層和干層的物性數(shù)據(jù),采用分布函數(shù)曲線法分別求取氣層的孔隙度和滲透率的下限值,認(rèn)為徐家圍子南部沙河子組氣層孔隙度下限為3.5%,滲透率物性下限值為0.053mD。
[Abstract]:This study follows sequence stratigraphy theory, starting with the lithologic data revealed by drilling, using logging method to assist, and using seismic unconformity. The Shahezi formation in the south of Xujiaweizi is divided into four third-order sequences from SQ1 to SQ1 in the south of Xujiaweizi. By means of core observation, grain size analysis, logging facies analysis and seismic reflection characteristics analysis, the sedimentary facies markers of Shahezi formation in the southern part of Xujiaweizi are summarized, and on the basis of these, the sedimentary facies of Shahezi formation in the south of Xujiaweizi are summarized. Based on the single-well sedimentary facies analysis and sequence stratigraphic framework control in the study area, it is considered that the sedimentary facies types in the study area mainly include fan delta, braided river delta, lacustrine facies, among which fan delta is developed in the western steep slope zone controlled by Xuxi fault. Braided river delta developed in the eastern gentle slope zone. Based on the analysis of reservoir physical properties, thin slices, scanning electron microscope and mercury injection experiment data of Shahezi formation in the south of Xujiaweizi, it is concluded that the lithology of tight sandstone in Shahezi formation is mainly lithic feldspathic sandstone and feldspathic lithoclastic sandstone. Calcareous cementation and muddy heterogeneity constitute the main interstitial material. The reservoir space is characterized by "rare primary pore, mostly secondary pore, microfracture and occasionally intergranular pore". The effective reservoir factors can be summed up as "sedimentary control, compaction leading, cementation increasing, corrosion and porosity, fracture and permeability", compaction and cementation can destroy reservoir physical properties by reducing pore space and filling throat. Dissolution plays a constructive role in reservoir physical properties through the formation of secondary dissolved pores, and microfractures produced by tectonic activity can improve reservoir permeability. On the plane, the front subfacies of the western fan delta is the most favorable reservoir development area, followed by the braided river delta front subfacies in the east. Because the physical property data of Shahezi formation in the south of Xujiaweizi are few, the physical property data of gas reservoir and dry layer of Shahezi formation in the south of Xujiaweizi are counted according to the well fitting physical property data and the comprehensive interpretation results. By using the distribution function curve method, the lower limit values of porosity and permeability of gas reservoir are obtained, and it is considered that the lower limit of porosity and permeability of Shahezi formation in the south of Xujiaweizi is 3.5mD and 0.053mDrespectively.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13
[Abstract]:This study follows sequence stratigraphy theory, starting with the lithologic data revealed by drilling, using logging method to assist, and using seismic unconformity. The Shahezi formation in the south of Xujiaweizi is divided into four third-order sequences from SQ1 to SQ1 in the south of Xujiaweizi. By means of core observation, grain size analysis, logging facies analysis and seismic reflection characteristics analysis, the sedimentary facies markers of Shahezi formation in the southern part of Xujiaweizi are summarized, and on the basis of these, the sedimentary facies of Shahezi formation in the south of Xujiaweizi are summarized. Based on the single-well sedimentary facies analysis and sequence stratigraphic framework control in the study area, it is considered that the sedimentary facies types in the study area mainly include fan delta, braided river delta, lacustrine facies, among which fan delta is developed in the western steep slope zone controlled by Xuxi fault. Braided river delta developed in the eastern gentle slope zone. Based on the analysis of reservoir physical properties, thin slices, scanning electron microscope and mercury injection experiment data of Shahezi formation in the south of Xujiaweizi, it is concluded that the lithology of tight sandstone in Shahezi formation is mainly lithic feldspathic sandstone and feldspathic lithoclastic sandstone. Calcareous cementation and muddy heterogeneity constitute the main interstitial material. The reservoir space is characterized by "rare primary pore, mostly secondary pore, microfracture and occasionally intergranular pore". The effective reservoir factors can be summed up as "sedimentary control, compaction leading, cementation increasing, corrosion and porosity, fracture and permeability", compaction and cementation can destroy reservoir physical properties by reducing pore space and filling throat. Dissolution plays a constructive role in reservoir physical properties through the formation of secondary dissolved pores, and microfractures produced by tectonic activity can improve reservoir permeability. On the plane, the front subfacies of the western fan delta is the most favorable reservoir development area, followed by the braided river delta front subfacies in the east. Because the physical property data of Shahezi formation in the south of Xujiaweizi are few, the physical property data of gas reservoir and dry layer of Shahezi formation in the south of Xujiaweizi are counted according to the well fitting physical property data and the comprehensive interpretation results. By using the distribution function curve method, the lower limit values of porosity and permeability of gas reservoir are obtained, and it is considered that the lower limit of porosity and permeability of Shahezi formation in the south of Xujiaweizi is 3.5mD and 0.053mDrespectively.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13
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