塔河托甫台地区中奥陶统一间房组储层特征与地震预测

通过岩芯观察、薄片鉴定、物性测试资料、常规测井资料等的综合分析,对托甫台地区中奥陶统一问房组碳酸盐岩的沉积相和储层特征及其分布进行研究发现:托甫台地区中奥陶统一间房组发育开阔台地相,包括台内滩、滩间海和点礁亚相.储集空间类型有晶间孔与晶间溶孔、粒问孔与粒间溶孔、粒内溶孔以及大小不等的溶洞等,它们与各种裂缝组成缝洞系统.储层类型有洞穴型、裂缝-孔洞型、裂缝型及孔洞-裂缝型等4种,以裂缝型和孔洞-裂缝型为主,储层非均质性强.在储层特征研究基础上分析储层响应地震特征,并运用地震波场特征参数融合技术进行储层地震预测,在研究区预测出4条南北向展布的带状大型缝洞单元.

RESERVOIR CHARACTERISTICS AND SEISMIC DETECTION OF THE YIJIANFANG FORMATION OF MIDDLE ORDOVICIAN IN TUOFUTAI AREA, TAHE OILFIELD, XINJIANG, CHINA

This paper studies the sedimentary facies,reservoir characteristics and seismic predic-tion of the Yijianfang Formation of Middle Ordovician in the Tuofutai area of Tahe oilfield. It is revealed that the depositional environment during the deposition of Yijianfang Formation in the studied area was an open marine platform facies, including intra-platform grain bank, interbank sea and patch reef subfacies. Main reservoir space was composed of intergrain pores, intergrain dissolved pores,fractures and caves with strong heterogeneity. Multiple dynamic parameters of seismic wave are used to directly demonstrate plane distribution of fracture-cave system. The plane distribution of the carbonate reservoir in the Yijianfang Formation is divided into 4 districts extending from north to south respectively.