【摘要】：鄂爾多斯盆地是一個多旋回疊合型盆地,是我國陸上的第二大沉積盆地,油氣資源豐富,油氣勘探與開發(fā)的潛力很大。它已經(jīng)成為我國未來油氣勘探與開發(fā)的最重要的戰(zhàn)略地區(qū)之一,其油氣資源的探明與開發(fā)直接影響著我國石油工業(yè)的發(fā)展。安塞油田作為鄂爾多斯盆地的一個主要產(chǎn)油區(qū),三疊系延長組長3油層組為鄂爾多斯盆地安塞地區(qū)的主要含油層系,其油氣資源的勘探開發(fā)有很重要的意義,為了進(jìn)一步地研究該區(qū)油氣聚集的規(guī)律,有必要對安塞油田橋19井區(qū)長3油層組的沉積相及油氣聚集規(guī)律做細(xì)致的研究。本文以沉積相與石油地質(zhì)理論為基礎(chǔ):采用野外地質(zhì)調(diào)查與室內(nèi)地質(zhì)研究相結(jié)合,綜合地質(zhì)背景、巖性組合、沉積構(gòu)造、沉積結(jié)構(gòu)、地球化學(xué)、儲層物性、試油氣及有機質(zhì)化學(xué)分析等資料,研究了安塞油田橋19井區(qū)長3油層組沉積微相的發(fā)育特征、地層及砂體的展布特征,在此基礎(chǔ)上,研究影響其油氣富集的因素。利用研究區(qū)主要標(biāo)志層,結(jié)合沉積旋回和地層等厚等原則,按傳統(tǒng)劃分方案,將研究區(qū)長3油層組劃分為311、長312、長32、長33四個小層,系統(tǒng)確定了各個小層之間的分層界線,詳細(xì)地描述了各層的巖電特征,為研究區(qū)的沉積相及油氣富集規(guī)律的研究奠定了良好的基礎(chǔ)。通過對砂體的平面展布形態(tài)、地層的巖電特征、砂泥比、沉積構(gòu)造類型、單井的沉積相剖面及粒度分析等研究表明,安塞油田長3儲層為三角洲平原亞相沉積,其沉積微相有:分流河道、河道側(cè)翼和分流間灣。在沉積微相研究的基礎(chǔ)上,分析了安塞油田長3儲層油氣富集規(guī)律。研究認(rèn)為:河道砂體是油氣富集的主要區(qū)帶;局部隆起構(gòu)造與上傾方向的巖性遮擋條件是油氣聚集的保證,隆起幅度越大,遮擋條件越好,油氣富集程度越高;油源對長3油氣的富集有一定的影響,但還需進(jìn)一步探討。在上述研究的基礎(chǔ)上,分析構(gòu)造、沉積和成巖作用與生儲蓋和油氣分布規(guī)律的關(guān)系,結(jié)合各層油藏控制因素和分布規(guī)律,通過劃分流動單元與試油試采數(shù)據(jù)相結(jié)合,確定成藏有利區(qū)。
[Abstract]:The Ordos Basin is a polycyclic superimposed basin and the second largest sedimentary basin on land in China with abundant oil and gas resources and great potential for oil and gas exploration and development. It has become one of the most important strategic areas for oil and gas exploration and development in the future in China, and the exploration and development of its oil and gas resources directly affect the development of China's petroleum industry. Ansai Oilfield is one of the main oil producing areas in Ordos Basin, and the third formation of Yanchang formation of Triassic is the main oil-bearing strata in Ansai area of Ordos Basin. The exploration and development of its oil and gas resources is of great significance. In order to further study the regularity of oil and gas accumulation in this area, it is necessary to study the sedimentary facies and hydrocarbon accumulation law of Chang3 reservoir formation in Qiao19 area of Ansai Oilfield. This paper is based on sedimentary facies and petroleum geology theory: combining field geological survey with indoor geological research, comprehensive geological background, lithologic combination, sedimentary structure, geochemistry, reservoir physical property, The development characteristics of sedimentary microfacies, distribution characteristics of strata and sand bodies in Chang 3 reservoir formation of well Qiao19 in Ansai Oilfield are studied. On the basis of these data, the factors influencing the accumulation of oil and gas are studied. Based on the principle of sedimentary cycle and formation equal thickness, the Chang 3 oil layer formation in the study area is divided into four sub-layers, namely, 311, 312, Chang32 and 33, according to the traditional division scheme. The stratification boundary between each sub-layer is determined systematically. The characteristics of rock and electricity in each layer are described in detail, which lays a good foundation for the study of sedimentary facies and oil and gas enrichment law in the study area. Through the study of the flat distribution morphology of sand body, the lithoelectric characteristics of formation, the ratio of sand to mud, the type of sedimentary structure, the sedimentary facies profile of single well and the grain size analysis, it is shown that Chang 3 reservoir in Ansai oilfield is delta plain subfacies deposit. The sedimentary microfacies include distributary channel, flanking channel and interdistributary bay. Based on the study of sedimentary microfacies, the oil and gas enrichment law of Chang 3 reservoir in Ansai Oilfield is analyzed. The study shows that the channel sand body is the main zone of oil and gas enrichment, the lithologic occlusion condition of local uplift structure and updip direction is the guarantee of oil and gas accumulation, the bigger the uplift amplitude is, the better the occlusion condition is, and the higher the oil and gas enrichment degree is. Oil source has a certain influence on the accumulation of Chang3 oil and gas, but it needs to be further discussed. On the basis of the above research, the relationship between structure, sedimentation and diagenesis and the distribution of source, reservoir, cap and oil and gas is analyzed. Combined with the control factors and distribution law of reservoir in each layer, the flow unit is divided into production test and production test data. Determine favorable areas for reservoir formation.
【學(xué)位授予單位】：西安石油大學(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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