【摘要】：本次論文研究在前人研究的基礎(chǔ)上,綜合鉆井測井資料、巖芯及薄片觀察,總結(jié)認識研究區(qū)中下奧陶統(tǒng)儲層主要儲集巖石類型、成巖作用特征,并建立相應(yīng)的成巖演化序列。研究區(qū)熱液成因儲集巖主要包括微晶灰?guī)r、顆�；�?guī)r、藻粘結(jié)灰?guī)r、白云巖以及硅化硅質(zhì)巖。研究區(qū)發(fā)育多種成巖作用,包括對儲層形成具有促進作用的白云石化作用、硅化作用、溶蝕作用、巖溶作用及破裂作用等,對儲層的形成具有阻礙作用的膠結(jié)作用、壓實壓溶作用、黃鐵礦化作用等。結(jié)合巖石學特征及地球化學分析,分析區(qū)內(nèi)白云石化和硅化作用機制并建立模式。根據(jù)各類白云石特征,將區(qū)內(nèi)白云巖分為粉-微晶白云石、粉-細晶它形臟白云石、粉-細晶自形白云石、中-粗晶白云石以及鞍狀白云石,區(qū)內(nèi)白云石經(jīng)歷了四期不同類型的白云石化作用,包括同生期高鹽度海水白云石化作用、早成巖期淺埋藏白云石化作用、早成巖期熱液白云石化作用、晚成巖期熱液白云石化作用,熱液白云石化作用對熱液儲層的形成具有重要意義。研究區(qū)發(fā)育兩期硅化作用,早期硅化作用以硅化硅質(zhì)結(jié)核或條帶為特征,對儲層發(fā)育起阻礙作用;晚期硅化發(fā)育較為廣泛,以石英交代及自形石英生長為特征,硅化作用的發(fā)育與二疊紀富硅熱液流體關(guān)系密切,晚期硅化作用形成的溶蝕孔隙和未完全充填不規(guī)則裂縫是熱液成因儲層重要的儲集空間。結(jié)合前期工作,對區(qū)內(nèi)熱液流體期次及作用機制模式進行總結(jié)。區(qū)內(nèi)存在兩期熱液作用,分別是晚奧陶世-志留紀的第I期熱液作用以及二疊紀的第II期熱液作用。晚奧陶世-志留紀的第I期熱液作用主要表現(xiàn)為陰極發(fā)光發(fā)暗玫瑰紅色光或近于不發(fā)光的多種形式的中-粗晶白云石發(fā)育,此期熱液作用流體來自地下深處,與中酸性巖漿活動有關(guān),在壓實作用與斷裂系統(tǒng)共同驅(qū)動之下,在研究區(qū)分布范圍較大。二疊紀的第II期熱液作用主要表現(xiàn)為發(fā)亮紅色光的溶蝕孔洞鞍狀白云石、硅化長柱狀石英晶體生長等特征,此期熱液流體是一期富硅的巖漿期后流體,主要受斷裂系統(tǒng)控制。區(qū)內(nèi)熱液成因儲層儲集空間類型主要有溶蝕孔隙、溶蝕孔洞以及熱液溶蝕不規(guī)則裂縫,儲層類型主要有有灰?guī)r熱液溶蝕孔洞型儲層和硅化硅質(zhì)巖熱液溶蝕型儲層兩類類。灰?guī)r熱液溶蝕孔洞型儲層是區(qū)內(nèi)主要的熱液成因儲層,現(xiàn)有資料揭示此類儲層主要分布于一間房組,儲集巖為顆�；�?guī)r及微晶灰?guī)r,儲集空間為溶蝕孔洞,儲層發(fā)育分布顯示出一定受斷裂控制的特征。硅化硅質(zhì)巖熱液溶蝕型儲層見于順南4井及順南401井鷹山組上段,儲集空間為長柱狀石英晶體粒間溶蝕孔隙及未完全充填的不規(guī)則縫洞,儲層的發(fā)育分布受斷裂控制,尤其在斷裂拉分段更為發(fā)育。
[Abstract]:On the basis of previous studies, this paper summarizes the main reservoir rock types and diagenetic characteristics of the middle and lower Ordovician reservoirs in the study area, and establishes the corresponding diagenetic evolution sequence based on the drilling logging data, core and thin slice observations. Hydrothermal reservoir rocks include microcrystalline limestone, granular limestone, algae-bonded limestone, dolomite and silicified siliceous rocks. Various diagenesis has been developed in the study area, including dolomitization, silicification, dissolution, karstification and fracture that promote the formation of reservoirs, which have hindered the formation of reservoirs. Compaction pressure solution, Huang Tie mineralization, etc. Combined with petrological characteristics and geochemical analysis, the mechanism of dolomitization and silicification in the area is analyzed and a model is established. According to the characteristics of various dolomites, the dolomites in the area are divided into powder-microcrystalline dolomite, powder-fine-grained dirty dolomite, powder-fine-grained self-shaped dolomite, medium-coarse-grained dolomite and saddle-shaped dolomite. The dolomite in the area has experienced four stages of dolomitization, including high salinity dolomitization in syngenetic period, dolomitization in early diagenetic period and hydrothermal dolomization in early diagenetic period. The hydrothermal dolomitization in late diagenetic period is of great significance to the formation of hydrothermal reservoirs. There are two stages of silicification in the study area, and the early silicification is characterized by siliceous nodules or bands, which hinders the development of reservoirs. The development of silicification is extensive, characterized by quartz metasomatism and self-shaped quartz growth. The development of silicification is closely related to the Permian silicon-rich hydrothermal fluid. Corrosion pores and incomplete filling irregular fractures formed by late silicification are important reservoir spaces for hydrothermal reservoirs. Combined with the previous work, the period of hydrothermal fluid in the area and the model of action mechanism were summarized. There are two periods of hydrothermal interaction in the area, namely the late Ordovician-Silurian stage I hydrothermal action and Permian stage II hydrothermal action. The hydrothermal action in the late Ordovician-Silurian stage I was mainly characterized by dark cathodolescent rose-red light or various forms of medium-coarse-grained dolomite near non-luminous, during which the hydrothermal fluid came from the depth of the ground. It is related to intermediate-acid magmatic activity. Driven by compaction and fault system, it is widely distributed in the study area. The hydrothermal action in Permian stage II is mainly characterized by bright red-light solute hole saddle dolomite and silicified columnar quartz crystal growth. The hydrothermal fluid in this period is a post-magmatic fluid with rich silicon, which is mainly controlled by the fracture system. The hydrothermal fluid in Permian is characterized by bright red-light dissolved holes, saddle-shaped dolomite and silicified long-columnar quartz crystal growth. The reservoir space types of hydrothermal origin reservoirs in this area are mainly corrosion pores, corrosion holes and hydrothermal corrosion irregular fractures. The reservoir types mainly include limestone hydrothermal solution pore type and siliceous rock hydrothermal solution type reservoir, which are mainly composed of two types: limestone hydrothermal solution pore type reservoir and siliceous rock hydrothermal solution type reservoir, which are mainly composed of limestone hydrothermal solution pore type and siliceous rock hydrothermal solution type reservoir. Limestone hydrothermal solution pore type reservoir is the main hydrothermal origin reservoir in this area. The existing data show that this type of reservoir is mainly distributed in a chamber formation, the reservoir rock is granular limestone and microcrystalline limestone, and the reservoir space is dissolved pore. The reservoir development and distribution shows the characteristics that are controlled by faults. The hydrothermal corroded reservoirs of siliceous rocks are found in the upper section of Yingshan formation in wells Shunnan 4 and Shunnan 401. The reservoir spaces are long columnar intergranular dissolution pores and irregular fracture holes that are not fully filled, and the development and distribution of the reservoirs are controlled by faults. Especially in the fracture tensile segment is more developed.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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