【作者】 田波；

【导师】 王允诚；

【作者基本信息】 成都理工大学 ， 矿产普查与勘探， 2004， 博士

【摘要】 长堤地区位于济阳坳陷沾化凹陷东北部。是在燕山运动末期、在中生代潜山背景上发育起来的北北东走向的下第三系低潜山披覆构造带。针对该区以隐蔽油藏为主要勘探对象、下第三系沉积规律和储层研究中存在的问题，本课题运用以基准面旋回为参考面的高精度层序地层学理论与技术，通过岩芯、钻井、三维地震资料的综合分析，将研究区下第三系划分为沙四段-沙三段和沙二段、沙一段-东营组两个构造基准面旋回；沙三段—东营组划分为三个长期基准面旋回(二级层序)和八个中期基准面旋回(三级层序)。三个长期基准面旋回大致相当于沙三段、沙一段和东营组。其中沙三段由三个中期基准面旋回组成；沙一段由一个中期基准面旋回组成；东营组由四个中期基准面旋回组成。建立起了适应当前隐蔽油藏预测精度要求的研究区下第三系高分辨率层序地层格架。 以中期旋回为单元，分析了该区沉积相的分布与演化规律。本区下第三系发育了近岸水下扇沉积相、滩坝沉积相、扇三角洲沉积相、浊积扇沉积相和河流沉积相等五大类。沉积相纵向演化具有很强的规律性，与区域构造演化及湖平面变化有密切的关系。沙三段主要是在本区西部及南部边缘发育近岸水下扇沉积；沙一段底部主要为生物滩坝沉积，其次为砂坝沉积，之后进入半深湖沉积环境；东营组为前扇三角洲亚相过渡到扇三角洲前缘亚相到扇三角洲平原亚相再到辫状河沉积的递进模式。 长堤潜山披覆构造带四周与生油洼陷相邻，具有优越的成藏条件。下第三系发现的油气藏以构造油气藏和地层油气藏为主。主要含油层位为沙河街组。沙三段的扇中砂体、沙一段底部的生物滩坝、东营组的河流砂体都是优越的储集层。本区油气富集于“两边一隆一斜坡”，富集层位及埋深呈现由南向北依次抬升的趋势。纵向上含油层系多，含油井段长，但富集程度不同。油气富集受构造背景、断裂、岩性、地层不整合、区域盖层等多种因素控制。本区的油气成藏系统可划分为中西部、东部两个成藏系统，各成藏系统具有不同的油气来源、充注因素、封盖条件等，建立了相应的成藏模式。 课题和生产紧密结合，研究成果及时的应用于生产实际中，综合分析了研究区的油气勘探潜力及主要勘探方向，对有利地区及层系作了分析评价，先后在桩47块、桩8-18块及桩1-斜41块获得重大勘探突破，在此基础上提出了八个下一步勘探的有利目标区，提交探井、滚动井10余口，预测石油地质储量1260万吨。更多还原

【Abstract】 Changdi area lies in the northeast of Zhanhua depression of Jiyang superdepression. It is a NNE-strike low buried-hill draping structural belt on the Mesozoic buried hill at the last phase of Yanshan movement. Aiming at subtle reservoir, this subject applies the theory and technology of high resolution sequence stratigraphy to solve the problems in research of deposition and reservoir of lower Tertiary. By integrative analysis of the cores, drilling and three-dimension seismic interpretation data, the Lower Tertiary of the study area is divided into two cycles of structural base level compsed by Es4-Es3 and Es2-Esl-Ed respectively. Es3-Ed comprises of three long term base-level cycles(secondary sequences ) and eight middle term base-level cycles (tertiary sequences ). The three long term base-level cycles are approximately equivalent to Es3,Esl and Ed, therein Es3 is composed of three middle term base-level cycles, Esl one cycle; and Ed four cycles. Based on the stratigraphic correlation of different order base-level, the sequence stratigraphic framework is built in Changdi area, which can meet the needs of subtle reservoir prediction.Based on middle-term cycles, the paper discussed the distribution and evolution of the depositional facies in study area. Five types of depositional facies in the Lower Tertiary are recognized. They are offshore subaqueous fan, beach sandbar, fan delta , turbidite fan and fluvial facies. The regularly vertical evolution of depositional facies has close relationship with the regional structure evolution and lake surfacechanges. During Es3 period, offshore subaqueous fan mainly developed in the west and south of the area. During Esl, the development of dipositonal facies experienced bioclastic sandbar, beach bar and semi-deep lake deposits was developing. During Ed, there was a progressive model from pre-fan delta, fan delta to fan delta plain and braided river at last.Being enclosed by hydrocarbon-generating subdepressions, Changdi buried-hill draping structural belt is of excellent conditions of reservoir. The reservoirs found in the Lower Tertiary are mainly structural and stratigraphic type. The main oil-bearing layer is Shahejie Formation. The middle fan sand in Es3, the bioclastic beach bar at the bottom of Esl, the river sand in Ed formed very best reservoir. In the area, oil and gas are enriched in "two side and one bulge and one slope". The rich layer and buried depth have an ascending tendency from south to north. Vertically, there are many thick oil-bearing beds with different enrichment. The enrichment of oil and gas is controlled by many factors including structural background, faults, lithology, stratigraphic unconformity, regional seal bed and so on. The reservoir-generating system in this area can be divided into two systems; the first is in the central west, the second east. Each of them has different sources, different fill factors and conceal conditions. Consequently, correspondent reservoir-generating models have been established.To guide the practice of production, the research analyzed the potential in oil and gas exploration, pointed out the main explorative directions, evaluated favorable areas and beds, which have made important explorative breakthroughs in these areas covering Zhuang 47, Zhuang 8-18 and Zhuang l-x41 blocks. At the same time, the study suggests eight favorable targets for next exploration, specifies the location of more than 10 prospective and developing wells with predicted petroleum geologic reserves 12600000 tons.更多还原