【摘要】：遼東灣坳陷位于渤海海域東北部,是下遼河坳陷向海域的延伸部分,是渤海灣盆地的一個(gè)富烴坳陷。本文系統(tǒng)研究了遼東灣坳陷不同構(gòu)造帶成藏條件差異性,并剖析了成藏主控因素,確立了成藏模式。遼東灣坳陷的三套主力烴源巖中,以沙三段最優(yōu),有機(jī)質(zhì)豐度高、類型好、熱演化程度高;沙一段次之,東三段熱演化程度低,大部分未進(jìn)入主生烴期�？傮w上北部優(yōu)于南部,遼中凹陷優(yōu)于遼西凹陷。由于區(qū)帶構(gòu)造背景、沉積相帶、成巖程度、儲(chǔ)集空間類型等的差異,不同類型區(qū)帶儲(chǔ)集條件、蓋層、生儲(chǔ)蓋組合明顯不同。低凸起區(qū)潛山帶沙三段蓋層質(zhì)量極為優(yōu)越,主要生儲(chǔ)蓋組合為新生古儲(chǔ)式;披覆構(gòu)造帶東三段蓋層封蓋能力最強(qiáng),主要生儲(chǔ)蓋組合為下生上儲(chǔ)式,斷層是溝通源儲(chǔ)的最重要媒介;凹中斷塊構(gòu)造帶由于斷層的溝通,蓋層封蓋能力變差,主要生儲(chǔ)蓋組合亦為下生上儲(chǔ)式。構(gòu)造圈閉是遼東灣坳陷最主要的圈閉類型,不同類型區(qū)帶代表性圈閉類型不同。凹中斷塊構(gòu)造帶主要發(fā)育半背斜、斷塊圈閉。凸起區(qū)潛山帶主要發(fā)育不整合遮擋、斷塊低潛山圈閉。凸起披覆構(gòu)造帶主要發(fā)育披覆背斜、半背斜、斷塊圈閉。洼陷帶主要發(fā)育巖性圈閉。不同類型的構(gòu)造帶輸導(dǎo)體系特征各異�？拷笮蛿嗔褞У陌贾袛鄩K構(gòu)造帶發(fā)育以斷層作為最關(guān)鍵油氣輸導(dǎo)通道的斷層型輸導(dǎo)體系;凸起區(qū)潛山帶主要發(fā)育以不整合為最主要輸導(dǎo)通道的不整合型輸導(dǎo)體系;凸起披覆構(gòu)造帶主要發(fā)育以斷層-砂體匹配組合為最主要輸導(dǎo)通道的斷層-砂體復(fù)合型輸導(dǎo)體系;而洼陷帶主要發(fā)育以砂體側(cè)向輸導(dǎo)為主要特征的油氣輸導(dǎo)體系。在分析油氣分布特征的基礎(chǔ)上,剖析了JZ20-2N,JX1-1,JZ25-1三個(gè)典型油氣田的成藏過程,總結(jié)了四個(gè)成藏主控因素:(1)烴源巖對(duì)油氣分布差異的控制,(2)斷裂對(duì)油氣運(yùn)聚成藏的控制,(3)儲(chǔ)層對(duì)油氣成藏的控制,(4)異常高壓對(duì)油氣成藏的控制。建立了典型區(qū)帶的成藏模式:(1)凹陷斷塊構(gòu)造帶油氣成藏模式,(2)凸起區(qū)潛山帶成藏模式,(3)凸起披覆構(gòu)造帶成藏模式,(4)洼陷帶成藏模式。
[Abstract]:The Liaodong Bay depression is located in the northeast of Bohai Sea, which is an extension of the lower Liaohe depression and a hydrocarbon rich depression in the Bohai Bay basin. In this paper, the differences of reservoir forming conditions in different structural zones in Liaodong Bay depression are systematically studied, and the main controlling factors of reservoir formation are analyzed, and the reservoir forming model is established. Among the three sets of main hydrocarbon source rocks in Liaodong Bay depression, the third member is the best, the organic matter abundance is high, the type is good, the thermal evolution is high, the first member of the sand is the second, the thermal evolution degree of the third member in the east is low, and most of them have not entered the main hydrocarbon generation stage. On the whole, the north is better than the south, and the central Liaoning sag is better than the western Liaoning sag. Because of the difference of tectonic background, sedimentary facies belt, diagenesis degree and reservoir space type, the reservoir conditions, caprocks and assemblages of source, reservoir and caprock in different types of zones are obviously different. The caprock quality of the third member of the buried hill belt in the low uplift area is extremely superior, and the main assemblage of the source, reservoir and caprock is the new paleo-reservoir type. The caprock sealing ability of the eastern third member of the drape structural belt is the strongest, the main assemblage of the source, reservoir and caprock is the lower generation and upper reservoir type, and the fault is the most important medium to communicate the source and reservoir. Because of the communication of faults, the sealing ability of caprock is poor, and the main assemblage of reservoir, caprock and caprock is lower generation and upper reservoir. Structural traps are the main types of traps in Liaodong Bay depression, and different types of traps represent different types of traps. The structural belt of the concave interrupt block mainly developed semi-anticline and fault block trap. The buried hill zone in the uplift area mainly develops unconformity occlusion and low buried hill trap of fault block. Drape anticline, semi-anticline and fault block trap are mainly developed in the uplift drape structural belt. Lithologic traps are mainly developed in the sag zone. Different types of tectonic belt transport systems have different characteristics. The fault type transportation system is developed in the concave block structural belt near the large fault zone, in which the fault is the most critical passage for oil and gas transportation, and the unconformity is the most important channel in the buried hill belt in the uplift area, and the unconformity is the most important channel in the fault-type transport system. The fault-sand complex transport system is mainly developed in the uplift drape structural belt with fault-sand body matching combination as the most important channel, while the oil and gas transport system with the main characteristics of lateral sand transport is developed in the sag zone. On the basis of analyzing the characteristics of oil and gas distribution, this paper analyzes the process of oil and gas accumulation in three typical oil and gas fields in JZ20-2N,JX1-1,JZ25-1, and summarizes four main controlling factors of oil and gas accumulation: (1) the control of hydrocarbon distribution difference by source rock; (2) the control of fault on hydrocarbon migration and accumulation, (3) the control of reservoir on oil and gas accumulation, and (4) the control of abnormal high pressure on oil and gas accumulation. The reservoir forming models of typical zones are established as follows: (1) oil and gas accumulation model of fault block structural belt in depression, (2) reservoir forming model of buried hill belt in uplift area, (3) accumulation model of uplift drape structural belt, (4) reservoir forming model of sag zone.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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