發(fā)布時(shí)間：2018-11-15 22:01

【摘要】：梨樹斷陷位于松遼盆地東南隆起區(qū),自1980年起開始油氣勘探,分為中央構(gòu)造帶、東南斜坡帶、北部斜坡區(qū)和西部斷褶區(qū)。研究區(qū)秦家屯油氣田位于東南斜坡帶,十屋八井井區(qū)-太平莊構(gòu)造地區(qū)位于中央構(gòu)造帶。目前中央構(gòu)造帶、東南斜坡帶主力油氣層位是白堊系登婁庫組和泉頭組,但深部層位如沙河子組仍是未來勘探開發(fā)的重點(diǎn)。本論文以高分辨率層序地層學(xué)、沉積學(xué)理論為指導(dǎo),在巖心、測井、地震資料等的精細(xì)分析基礎(chǔ)上,對研究區(qū)沙河子組地層做了詳細(xì)對比和劃分,并系統(tǒng)研究了沙河子組的沉積特征,分析了沉積特征與油氣成藏的關(guān)系,取得了以下認(rèn)識和成果：(1)通過地質(zhì)與地球物理相結(jié)合的方法,利用地震數(shù)據(jù)中標(biāo)定的T41和T5(或T42)反射面來確定沙河子組的頂?shù)捉缇�。利用測井解釋中的高GR泥巖的頂界作為沙河子組沙Ⅱ段和沙Ⅰ段的劃分標(biāo)志層,沙Ⅲ段與沙Ⅱ段以測井曲線GR和AC的變化為識別標(biāo)準(zhǔn),在曲線變化的臺階處為劃分標(biāo)志。將秦家屯油田和十屋八井井區(qū)的沙河子組地層劃分為三段,太平莊地區(qū)處于構(gòu)造高部位,在水體較淺時(shí)沉積間斷,缺失沙Ⅰ段沉積,劃分為兩段。(2)通過巖心觀察、巖心相、測井相、單井相、連井相、沉積演化與沉積模式等分析,結(jié)合砂巖厚度等值線圖、砂地比值等值線圖、沉積相平面圖等圖件,對研究區(qū)沙河子組沉積特征進(jìn)行分析。結(jié)果表明,研究區(qū)內(nèi)沙河子組主要存在湖泊沉積和三角洲沉積(包括扇三角洲、辮狀河三角洲、曲流河三角洲),共識別出10種亞相21種微相。主要存在有三個(gè)物源體系,分別是來自研究區(qū)東南部的秦家屯油氣田物源體系、東北部的十屋八井井區(qū)物源體系與北部的太平莊構(gòu)造物源體系,西部主要為淺湖-半深湖沉積。(3)在沉積特征分析的基礎(chǔ)上,結(jié)合對研究區(qū)構(gòu)造特征和斷層活動(dòng)期次的分析,認(rèn)為秦家屯油氣田和太平莊構(gòu)造地區(qū)砂巖、砂礫巖發(fā)育,地層埋藏淺,暗色泥巖難以生烴,油氣來自于西側(cè)的凹陷區(qū),運(yùn)移通道為連通性較好的砂體和不整合面。油氣遠(yuǎn)距離運(yùn)移,以構(gòu)造油氣藏為主。十屋八井區(qū)沙河子組沉積時(shí),處于構(gòu)造的低部位,其沉積特征與秦家屯油氣田、太平莊構(gòu)造地區(qū)明顯不同,以湖相沉積為主,易于形成構(gòu)造-巖性復(fù)合油氣藏。
[Abstract]:Lish fault depression is located in the southeast uplift area of Songliao Basin. Since 1980, oil and gas exploration has been started. It can be divided into central structural belt, southeast slope zone, northern slope area and western fault fold area. The Qinjiatun oil and gas field is located in the southeast slope zone, and the Shiwu-Taipingzhuang structural area is located in the central structural belt. At present, the main oil and gas formations in the central structural belt and southeastern slope belt are the Cretaceous Denglouku formation and the Quantou formation, but the deep strata such as the Shahezi formation are still the focus of exploration and development in the future. Guided by the theory of high-resolution sequence stratigraphy and sedimentology and on the basis of fine analysis of core, logging and seismic data, the strata of Shahezi formation in the study area are compared and divided in detail. The sedimentary characteristics of Shahezi formation are systematically studied, and the relationship between sedimentary characteristics and hydrocarbon accumulation is analyzed. The results are as follows: (1) through the combination of geology and geophysics, The top and bottom boundaries of the Shahezi formation are determined by using the T41 and T5 (or T42) reflectance surfaces calibrated in the seismic data. The top boundary of high GR mudstone in logging interpretation is used as the division marker of Shahezi formation and Shahezi formation. The variation of GR and AC in logging curve is used as the identification standard and the division mark is used at the step of curve change between Shahezi formation and Shahezi formation, and the variation of GR and AC in logging curve is regarded as the identification standard between Shahezi formation and Shahezi formation. The formation of Shahezi formation in Qinjiatun Oilfield and Shiwu well area is divided into three sections. Taipingzhuang area is located in a high structural position, with sedimentary discontinuity when the water is shallow, and the missing sand I member is divided into two sections. (2) through core observation, Core facies, logging facies, single well facies, contiguous well facies, sedimentary evolution and sedimentary model are analyzed. The sedimentary characteristics of Shahezi formation in the study area are analyzed in combination with sandstone thickness isoline map, sandground ratio isoline map, sedimentary facies plane map and so on. The results show that there are mainly lacustrine and delta deposits (including fan delta, braided river delta and meandering river delta) in the Shahezi formation, and 10 subfacies and 21 microfacies are identified. There are mainly three source systems, namely, the source system of Qinjiatun oil and gas field in the southeast of the study area, the material source system of Shiwu well area in the northeast and the source system of Taipingzhuang structure in the north. The west is mainly composed of shallow lacustry-semi-deep lake sediments. (3) based on the analysis of sedimentary characteristics, combined with the analysis of structural characteristics and fault activity stages in the study area, it is considered that sandstone and gravel are developed in Qinjiatun oil and gas field and Taipingzhuang structural area. The formation is shallow buried, dark mudstone is difficult to generate hydrocarbon, oil and gas come from the depression in the west, and the migration channel is sand body and unconformity surface with good connectivity. The long distance migration of oil and gas is dominated by structural reservoirs. The Shahezi formation in Shiwu well area is in the lower part of the structure, and its sedimentary characteristics are obviously different from those in Qinjiatun oil and gas field and Taipingzhuang structural area. The lacustrine facies is the main sedimentary area, and it is easy to form a structure-lithologic compound oil and gas reservoir.
【學(xué)位授予單位】：吉林大學(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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相關(guān)期刊論文 前1條

1 劉計(jì)勇;蘭正凱;皮定成;;松遼盆地南部十屋斷陷層沉積體系類型及特征[J];內(nèi)蒙古石油化工;2008年22期

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本文編號：2334520