CAJ | 학술논문

综合应用油气地球化学、储层沉积学及成藏综合研究方法，剖析了琼海凸起文昌13区珠江组一段低幅-低阻油藏的油气来源、运移及成藏特征，深化了该区高阻、低阻油层成藏过程及运聚规律的认识。研究表明：1）文昌13-X珠江组一段低阻油层的原油主要来自文昌A凹陷恩平组浅湖相泥岩，该套烃源岩是文昌凹陷除文昌组中深湖泥岩之外的又一套优质生油岩。2）文昌13区珠江组一段低阻油层具备发育在低幅度披覆背斜上的构造＋岩性成藏模式，储层类型为浅海低能环境下发育的滨外砂坝泥质粉砂岩，储层岩性细、泥质含量高是低阻油层形成的主要原因。3）本区低阻油藏具备圈闭低幅度、储层低渗的特征，油气运移进入圈闭需要克服较大的毛细管阻力。4）本区珠江组一段低阻油层是其下覆高阻油层的次生油藏，形成纵向上高阻、低阻油层叠置伴生的油气富集带；低幅-低阻油藏勘探开发潜力大，是成熟区挖潜的重要领域。
종합응용유기지구화학、저층침적학급성장종합연구방법，부석료경해철기문창13구주강조일단저폭-저조유장적유기래원、운이급성장특정，심화료해구고조、저조유층성장과정급운취규률적인식。연구표명：1）문창13-X주강조일단저조유층적원유주요래자문창A요함은평조천호상니암，해투경원암시문창요함제문창조중심호니암지외적우일투우질생유암。2）문창13구주강조일단저조유층구비발육재저폭도피복배사상적구조＋암성성장모식，저층류형위천해저능배경하발육적빈외사패니질분사암，저층암성세、니질함량고시저조유층형성적주요원인。3）본구저조유장구비권폐저폭도、저층저삼적특정，유기운이진입권폐수요극복교대적모세관조력。4）본구주강조일단저조유층시기하복고조유층적차생유장，형성종향상고조、저조유층첩치반생적유기부집대；저폭-저조유장감탐개발잠력대，시성숙구알잠적중요영역。
Using geochemical ,sedimentary and hydrocarbon accumulation analysis methods ,this paper studied the charac-teristics of source rocks ,hydrocarbon migration and accumulation of the low resistivity reservoirs of the 1st Member of Zhu-jiang Formation(Zhu1)in the low-amplitude structure of Qionghai salient in Wenchang-13 block,Qionghai salient.The following results were obtained .The oil of the Zhu1 low resistivity reservoir in Wenchang 13-X is mainly sourced from the shallow lacustrine mudstone of Enping Formation in Wenchang sag ,which is another high quality source rock in addition to the Wenchang Formation mudstone of mid-deep lacustrine faciesin .The low resistivity reservoirs of Zhu 1 in Wen-chang13 block are of structural-lithologic composite type developed in the low amplitude drape anticlines .The main reser-voir consists of offshore fine muddy siltstone with fine grain and high mud content ,which are the main causes of the low resistivity .The low resistivity reservoirs area characterized by low amplitude structure and low permeability .The low resis-tivity reservoirs are secondary accumulation with hydrocarbons sourced from the underlying high resistivity reservoir .The low resistivity and high resistivity reservoirs superimpose vertically to form a hydrocarbon enrichment zone .The low resis-tivity reservoirs in low amplitude structure are important targets for potential -tapping in mature area .