CAJ | 학술논문

蓬莱19-3油田位于渤海海域渤南凸起中段的东北端、郯庐断裂带的东支，油田构造类型属于在古隆起背景上发育起来的、被断层复杂化了的断裂背斜。主力油层发育于上第三系馆陶组和明化镇组下段，储集层岩性为河流相的陆源碎屑岩，油层厚度63～151m，含油面积50km2以上，石油地质储量为数亿吨级。蓬莱19-3油田断层十分发育，浅层构造破碎，油气分布产状及压力系统较复杂，属于由多断块组成的、纵横向上存在多套油水系统的构造层状油藏。地面原油密度较大、黏度较高、凝固点低，地层原油饱和压力较高、地饱压差小，溶解气油比中等，原油的生物降解和水洗作用较为明显。油源对比分析表明，油气主要来自周缘凹陷下第三系东营组下段和沙河街组的烃源岩。据区域构造史研究，蓬莱19-3构造的发展、定型以及油藏的形成与郯庐断裂长期强烈的构造运动有着密切关系，特别是晚第三纪的多次构造活动导致新生界产生众多断裂和大量微裂缝，成为油气由凹陷向凸起运移的良好通道，为蓬莱19-3构造的最终成藏起到了重要作用。图5参3 (郭太现摘)
봉래19-3유전위우발해해역발남철기중단적동북단、담려단렬대적동지，유전구조류형속우재고륭기배경상발육기래적、피단층복잡화료적단렬배사。주력유층발육우상제삼계관도조화명화진조하단，저집층암성위하류상적륙원쇄설암，유층후도63～151m，함유면적50km2이상，석유지질저량위수억둔급。봉래19-3유전단층십분발육，천층구조파쇄，유기분포산상급압력계통교복잡，속우유다단괴조성적、종횡향상존재다투유수계통적구조층상유장。지면원유밀도교대、점도교고、응고점저，지층원유포화압력교고、지포압차소，용해기유비중등，원유적생물강해화수세작용교위명현。유원대비분석표명，유기주요래자주연요함하제삼계동영조하단화사하가조적경원암。거구역구조사연구，봉래19-3구조적발전、정형이급유장적형성여담려단렬장기강렬적구조운동유착밀절관계，특별시만제삼기적다차구조활동도치신생계산생음다단렬화대량미렬봉，성위유기유요함향철기운이적량호통도，위봉래19-3구조적최종성장기도료중요작용。도5삼3 (곽태현적)
Penglai 19-3 oil field is located in the northeast of middle Bonan Uplift in Bohai Sea and on the east branch of Tancheng-Lujiang deep faulted zone. The structure of the field is a faulted anticline developed on a palaeohigh and complicated by the faults. The structural area is 65km2. The main pay zone of the field exists in Guantao Formation and Lower Minghuazhen Formation of Neogene. The lithology of the reservoir is fluvial terrigenous clastic rock. According to the drilling data of 7 wells, the thickness of the pay zone in the field is 63-151m, the oil-bearing area is more than 50km2 and the OOIP is hundreds of million tons. The shallow structure of this field is broken due to the well-developed faults, which results in the complicated hydrocarbon occurrence and pressure systems. This oil field is a structural layered reservoir that consists of many faulted blocks and has multiple oil-water systems in both vertical and lateral directions.Penglai 19-3 oil field is characterized by crude oil with high surface density,high viscosity and low pour point, high oil saturation pressure, little pressure difference between formation and saturation pressures, moderate dissolved gas-oil ratio and distinct biodegradation and water washing. According to the oil-source correlation analysis, the hydrocarbon of the field mainly comes from source rock of Lower Dongying Formation and Shahejie Formation of Palaeogene in the surrounding sags.According to the study of tectonic history, the development and formation of the structure and the reservoir of Penglai 19-3 oil field is closely relative to the long-term and strong tectonic movements of Tancheng-Lujiang deep faulted zone, especially many tectonic movements happened in Neogene period. Consequently developed many faults and numerous microcracks in Cenozoic formation that are good hydrocarbon migration pathways from sags to uplifts, and play an important role in finally forming the reservoir in Penglai 19-3 structure. The discovery of Penglai 19-3 oil field is a new breakthrough in hydrocarbon exploration history of Bohai Sea, having great significance for steady and sustainable development of offshore petroleum industry in China.