川东北元坝地区长兴组生物礁发育模式与储层预测

发布时间：2018-08-31 14:41

【摘要】：元坝气田长兴组气藏主体为埋藏超深的缓坡型台缘生物礁气藏,为解决气藏开发评价面临的生物礁发育模式复杂多样、储层分布规律不清、超深薄储层精确预测难度大等问题,本文探讨了海平面升降变化与生物礁发育模式的关系,分析了礁相白云岩储层发育主控因素,提出了生物礁储层预测的思路与方法,明确了生物礁储层平面展布特征。研究表明:元坝地区长兴组地层中共发育4期生物礁,受古地貌和海平面升降变化控制,单礁体可分为单期礁和双期(多期)礁两种模式。礁群可分为纵向进积式、纵向退积式、横向迁移式、横向并列式、复合叠加式5种模式;元坝地区生物礁储层发育主要受沉积背景、海平面升降变化、建设性成岩作用及构造破裂作用控制,垂向上储层主要发育于礁盖,横向上主要发育于礁顶,礁后次之,礁前较差。
[Abstract]:The main body of Changxing formation gas reservoir in Yuanba gas field is buried and ultra-deep platform edge reef gas reservoir. In order to solve the problems of complex development model of reef, unclear reservoir distribution law and difficulty of accurate prediction of ultra-deep and thin reservoir, etc. In this paper, the relationship between the change of sea level rise and fall and the model of reef development is discussed. The main factors controlling the development of reef dolomite reservoir are analyzed, the thought and method of prediction of reef reservoir are put forward, and the flat distribution characteristics of reef reservoir are defined. The results show that the formation of Changxing formation in Yuanba area is characterized by four stages of reefs, which are controlled by paleogeomorphology and sea level fluctuation, and the single reef can be divided into two models: single reef and double stage reef. The reef group can be divided into five types: longitudinal progradation, longitudinal retrogradation, lateral migration, lateral parallel, compound superposition, and the reservoir development of reef in Yuanba area is mainly affected by sedimentary background, sea level rise and fall. Under the control of constructive diagenesis and structural rupture, the vertical reservoir is mainly developed in the reef cap, laterally in the top of the reef, then in the back of the reef, and then in the front of the reef.
【作者单位】：中国石化西南油气分公司;中国石化西南油气分公司勘探开发研究院;
【基金】：国家科技重大专项(2016ZX05017-005)
【分类号】：P618.13

【相似文献】