西藏色林錯地區(qū)下白堊統(tǒng)多尼組沉積特征分析與儲層評價
發(fā)布時間：2019-04-24 00:25
【摘要】：措勤盆地色林錯地區(qū)多尼組按巖性分可以分為三段,分別為多尼組一段、多尼組二段、多尼組三段,其中多尼組一段以泥頁巖為主,多尼組二、三段以砂礫巖為主,其中多尼組二、三段是主要的儲集層,為本文重點研究區(qū)段。本論文通過野外實測剖面觀測及具體的室內(nèi)研究分析,室內(nèi)分析主要包括薄片鑒定、物性分析和陰極發(fā)光分析。該區(qū)多尼組時期發(fā)育三角洲相,可劃分出三角洲平原、三角洲前緣、前三角洲三個沉積亞相體系。色林錯地區(qū)下白堊統(tǒng)多尼組時期垂向上由早到晚巖石顆粒粒度由細逐漸變粗,巖石色調(diào)整體從灰綠色、黑色到灰白色到紫紅色,綜合分析可知色林錯地區(qū)巴布日剖面在下白堊統(tǒng)多尼組時期,水體由早到晚逐漸變淺,由還原環(huán)境向氧化環(huán)境過渡。該區(qū)儲層巖性主要為長石巖屑砂巖,其次為巖屑長石砂巖,局部可見少量巖屑石英砂巖和長石砂巖,顆粒粒徑主要分布在0.15mm-0.68mm,顆粒分選中等,次棱角狀—次圓狀,總體上結(jié)構(gòu)成熟度和成分成熟度均較低,局部成分成熟度較高。該研究區(qū)主要膠結(jié)物主要以碳酸鹽膠結(jié)物和硅質(zhì)膠結(jié)物較常見,含有少量的粘土雜基,其中碳酸鹽膠結(jié)物主要為方解石膠結(jié)物,且在多尼組二段中膠結(jié)物含量明顯較高。多尼組砂巖儲集空間主要為原生殘余粒間孔、次生溶孔和微裂縫,其中次生溶孔分布較廣,主要表現(xiàn)為粒內(nèi)溶孔和粒間溶孔,而微裂縫主要以構(gòu)造裂縫和成巖裂縫較為常見,多尼組二段較發(fā)育。研究區(qū)儲層物性總體較差,屬于低孔低滲儲層,平均孔隙度為4.47%,平均滲透率為0.3575×10-3um2。通過對該研究區(qū)多尼組儲層砂巖成巖作用的研究認為,該區(qū)多尼組成巖階段可能處于中成巖B期。其中壓實作用和晚期碳酸鹽膠結(jié)作用是儲層孔隙減少的主要原因,部分膠結(jié)作用(如石英的次生加大等)一方面占據(jù)了部分儲集空間,另一方面又增加了巖石的抗壓實能力,阻止了孔隙的減少,對深埋藏條件下孔隙的保存具有重要作用,而溶蝕孔和微裂縫的發(fā)育,則極大的增加和改善了儲層的儲集空間和性能。沉積相與儲層巖石特征對儲層物性的分析指出該區(qū)儲層物性主要受沉積作用的控制,以分流河道微相的儲層物性最好,河口砂壩次之;儲層砂體發(fā)育于同一沉積微相的儲層中,粗砂巖的儲層物性要高于中砂巖,巖石類型主要是巖屑長石砂巖和長石巖屑砂巖。且通過分析可知在巴布日地區(qū)多尼組時期沉積微相對儲層物性的控制和影響要稍強于巖性,多尼組中多尼組二段儲集砂巖具有良好的儲集性能。
[Abstract]:The Doni formation can be divided into three segments according to lithology in Xilinzuo area of Cuoqin Basin, which are Doni formation 1, Doni 2 and Doni 3, in which the first member of Doni formation is mainly mudstone, the second and third member of Doni formation is mainly composed of sand conglomerate, and the second and third member of Doni formation are mainly composed of sand conglomerate. The second and third member of Doni formation is the main reservoir, which is the key research section of this paper. In this paper, field observation and laboratory analysis are carried out. Laboratory analysis mainly includes thin film identification, physical property analysis and cathodoluminescence analysis. The delta facies can be divided into three sedimentary subfacies systems: Delta plain, delta front and pre-delta during the Doni formation period in this area. During the Doni formation of the Lower Cretaceous in Xilinzuo area, the grain size of the rock was gradually thickened gradually from the early to the late, and the color of the rock was from grayish green, black to grayish white to purplish red. Comprehensive analysis shows that during the Doni formation period of Lower Cretaceous, the water body gradually shallows from early to late, and changes from reductive environment to oxidation environment. The reservoir lithology in this area is mainly feldspar lithic sandstone, followed by lithic feldspathic sandstone, and a small amount of lithic quartz sandstone and feldspar sandstone can be seen locally. The grain size is mainly distributed in 0.15mm ~ 0.68mm. On the whole, the maturity of structure and composition is lower, and the maturity of local composition is higher. The main cements in the study area are mainly carbonate cements and siliceous cements, which contain a small amount of clay hetero-groups, in which carbonate cements are mainly calcite cements, and the content of cements in the second stage of Doni formation is obviously higher. The reservoir space of Doni sandstone is mainly composed of primary residual intergranular pores, secondary dissolved pores and microfractures, among which secondary dissolved pores are widely distributed, mainly intragranular dissolved pores and intergranular dissolved pores, while micro-fractures are mainly structural fractures and diagenetic fractures. The second stage of Doni formation is more developed. The reservoir in the study area is generally poor in physical properties, belonging to low porosity and low permeability reservoir, with an average porosity of 4.47% and an average permeability of 0.3575 脳 10 ~ (- 3) mm ~ (2-2). Based on the study of sandstone diagenesis of Doni formation in this study area, it is concluded that the Doni compositional stage in this area may be in the middle diagenetic stage B. Compaction and late carbonate cementation are the main causes of reservoir porosity reduction. Partial cementation (such as secondary increase of quartz, etc.) occupies part of the reservoir space on the one hand, and on the other hand, increases the compressive compaction capacity of rocks. It prevents the decrease of pores and plays an important role in the preservation of pores under deep burial conditions. However, the development of dissolution pores and micro-fractures greatly increases and improves the reservoir space and performance. The analysis of sedimentary facies and reservoir rock characteristics on reservoir physical properties indicates that the reservoir physical properties in this area are mainly controlled by sedimentation, and the reservoir physical properties of distributary channel microfacies are the best, followed by estuarine sandbars. The reservoir sand body is developed in the same sedimentary microfacies reservoir, the reservoir physical property of coarse sandstone is higher than that of middle sandstone, and the rock types are mainly clastic feldspathic sandstone and feldspar lithic sandstone. Through the analysis, it can be seen that the physical property control and influence of sedimentary micro-relative reservoir in Doni formation period in Babi area is stronger than lithology, and the second member reservoir sandstone of Doni formation in Doni formation has good reservoir performance.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P618.13;P534.53
本文編號：2463946
[Abstract]:The Doni formation can be divided into three segments according to lithology in Xilinzuo area of Cuoqin Basin, which are Doni formation 1, Doni 2 and Doni 3, in which the first member of Doni formation is mainly mudstone, the second and third member of Doni formation is mainly composed of sand conglomerate, and the second and third member of Doni formation are mainly composed of sand conglomerate. The second and third member of Doni formation is the main reservoir, which is the key research section of this paper. In this paper, field observation and laboratory analysis are carried out. Laboratory analysis mainly includes thin film identification, physical property analysis and cathodoluminescence analysis. The delta facies can be divided into three sedimentary subfacies systems: Delta plain, delta front and pre-delta during the Doni formation period in this area. During the Doni formation of the Lower Cretaceous in Xilinzuo area, the grain size of the rock was gradually thickened gradually from the early to the late, and the color of the rock was from grayish green, black to grayish white to purplish red. Comprehensive analysis shows that during the Doni formation period of Lower Cretaceous, the water body gradually shallows from early to late, and changes from reductive environment to oxidation environment. The reservoir lithology in this area is mainly feldspar lithic sandstone, followed by lithic feldspathic sandstone, and a small amount of lithic quartz sandstone and feldspar sandstone can be seen locally. The grain size is mainly distributed in 0.15mm ~ 0.68mm. On the whole, the maturity of structure and composition is lower, and the maturity of local composition is higher. The main cements in the study area are mainly carbonate cements and siliceous cements, which contain a small amount of clay hetero-groups, in which carbonate cements are mainly calcite cements, and the content of cements in the second stage of Doni formation is obviously higher. The reservoir space of Doni sandstone is mainly composed of primary residual intergranular pores, secondary dissolved pores and microfractures, among which secondary dissolved pores are widely distributed, mainly intragranular dissolved pores and intergranular dissolved pores, while micro-fractures are mainly structural fractures and diagenetic fractures. The second stage of Doni formation is more developed. The reservoir in the study area is generally poor in physical properties, belonging to low porosity and low permeability reservoir, with an average porosity of 4.47% and an average permeability of 0.3575 脳 10 ~ (- 3) mm ~ (2-2). Based on the study of sandstone diagenesis of Doni formation in this study area, it is concluded that the Doni compositional stage in this area may be in the middle diagenetic stage B. Compaction and late carbonate cementation are the main causes of reservoir porosity reduction. Partial cementation (such as secondary increase of quartz, etc.) occupies part of the reservoir space on the one hand, and on the other hand, increases the compressive compaction capacity of rocks. It prevents the decrease of pores and plays an important role in the preservation of pores under deep burial conditions. However, the development of dissolution pores and micro-fractures greatly increases and improves the reservoir space and performance. The analysis of sedimentary facies and reservoir rock characteristics on reservoir physical properties indicates that the reservoir physical properties in this area are mainly controlled by sedimentation, and the reservoir physical properties of distributary channel microfacies are the best, followed by estuarine sandbars. The reservoir sand body is developed in the same sedimentary microfacies reservoir, the reservoir physical property of coarse sandstone is higher than that of middle sandstone, and the rock types are mainly clastic feldspathic sandstone and feldspar lithic sandstone. Through the analysis, it can be seen that the physical property control and influence of sedimentary micro-relative reservoir in Doni formation period in Babi area is stronger than lithology, and the second member reservoir sandstone of Doni formation in Doni formation has good reservoir performance.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P618.13;P534.53
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