塔中奥陶系储层特征与流体流动特征

发布时间：2018-04-02 22:10

本文选题：鹰山组　切入点：成岩序列　出处：《长江大学》2015年硕士论文

【摘要】：塔中地区下古生界奥陶系鹰山组是塔里木盆地油气勘探的主要层系。传统意义上沉积岩原生孔隙的死亡深度是6000m,但是塔中鹰山组储层的的普遍埋深超过6000m,储层的孔渗物性较好,且部分白云岩储层孔隙度最高能达到17%,这些孔隙只能是成岩作用形成的次生孔隙,因此研究这些次生孔隙的成因,对塔中地区的勘探和稳产具有重要意义。本文利用塔中32口井的岩心描述,岩石薄片镜下观察,阴极发光,扫描电镜资料分析鹰山组的成岩作用类型,描述碳酸盐岩胶结物的特征,测试其中流体包裹体均一化温度,建立塔中成岩作用序列。其次利用岩心资料,测井资料,成像测井技术等对鹰山组储层进行描述,对储集空间类型进行分类,分析不同储层的孔渗物性,并对塔中鹰山组主要发育的岩溶型储层和热液溶蚀型储层的特征和分布进行描述。在此基础上,利用油田水的测试数据和锶同位素数据,结合前人对塔中油气水断层注入点的研究成果,追踪溶蚀流体的来源和流动方向,最终探讨塔中鹰山组深层优质白云岩储层的演化模式。根据岩心描述、岩石镜下薄片观察、扫描电镜以及流体包裹体测温资料,结合塔中地区经历的地质事件,认为塔中鹰山组地层在沉积同生期经历了同生溶蚀作用、破裂作用和胶结作用；在加里东中期因为挤压,地层被抬升形成塔中隆起,鹰山组地层经历了大面积表生溶蚀；海西期构造运动强烈,塔中隆起东部大幅度隆升,鹰山组地层经历破裂作用,产生了与之相关的萤石、天青石,方解石的充填,热液沿着断裂侵入灰岩发生了热液白云岩化；对方解石中包裹体进行测试分析,认为鹰山组具有三期方解石充填,分别对应加里东末期,海西期,和喜山期；在海西期后鹰山组地层进入深埋期经历了压溶作用、交代作用和热液溶蚀作用,最终建立鹰山组地层成岩序列。在成岩序列的研究基础上,在碳酸盐岩储层油藏描述研究思路指导下,利用成像测井资料,岩心资料及测井响应资料对塔中鹰山组的碳酸盐岩储集空间进行研究,将塔中鹰山组的储集空间分为孔隙,裂缝和洞穴三种储集空间。对塔中鹰山组储层储集空间进行分类分析,发现主要分为储层类型包括孔洞型、裂缝型、洞穴型、裂缝-孔洞型四类储层。并且分析不同储层的储层物性分析(孔隙度、渗透率、面孔率等),发现白云岩储层的物性明显比灰岩储层要好,白云岩储层中构造-热液白云岩储层储层物性最好。中古5-中古7井区鹰山组储层表生阶段主要受到岩溶作用影响,岩溶型储层纵向上多期叠置,横向连续性好,呈准层状分布；埋藏阶段发育热液白云岩,储层发育规模不大,常与断层,物性较好的灰岩和致密灰岩遮挡层相伴生,在埋藏后期还有热液溶蚀。热液白云岩的发育与热液流体密切相关,利用塔中鹰山组油田水测试资料和锶同位素资料,结合前人对塔中鹰山组油气水断层注入点研究成果,分析塔中鹰山组的地层水测流动特征。分析认为中古5-中古7井区的油气藏成藏后保存条件较好。热液沿着中古5走滑断裂与塔中Ⅰ号断裂带的交汇处注入,并向西南、南和东南三个方向流动,在中古5-中古7井区发生热液白云岩化和热液溶蚀作用。因此塔中中古5-7井区下奥陶鹰山组的深层优质白云岩是经历了表生期岩溶的高孔隙岩溶灰岩储层,在埋藏发生热液白云化作用和热液溶蚀作用而形成的深层优质储层。
[Abstract]:In this paper , the authors describe the origin and flow direction of the reservoirs in the Yingshan Formation by using the data of core data , logging data , imaging logging technique and so on , and then discuss the characteristics and distribution of the karst reservoir and hydrothermal solution reservoir .
In the mid - east of the Tarim basin , the formation was raised to form the uplift of the tower , and the formation of the Yingshan Formation experienced extensive surface erosion ;
The tectonic movement in the western part of the sea is strong , the eastern part of the middle uplift of the tower is greatly raised , and the formation of the Yingshan Formation is subjected to the fracturing effect , which results in the filling of fluorite , celestite and calcite , which is related to it , and hydrothermal dolomitization occurs in the hydrothermal solution along the broken intrusion limestone ;
In this paper , the inclusions in calcite were tested and analyzed , and it was found that the Yingshan Formation had three - stage calcite filling , which corresponded to the end - end , the current period and the Himalayan period respectively .
In this paper , the reservoir space of Yingshan Formation is classified and analyzed by using imaging logging data , core data and logging response data . It is found that reservoir types include pore - type , fracture - type , cave - type , fracture - hole - type four - type reservoirs .
This paper analyzes the formation water flow characteristics of Yingshan Formation in Zhonggu 5 - Zhonggu 7 well . It is believed that the deep - quality dolomite of the Ordovician Yingshan Formation in Zhonggu 5 - Zhonggu area is a high - porosity karst limestone reservoir which has undergone epiphytic karst .

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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