摘要
针对塔里木盆地奥陶系碳酸盐岩储层裂缝埋藏深、期次复杂且定量表征难的问题,以塔西北典型露头为研究对象,采用数字露头表征技术对裂缝进行系统性识别与描述,基于裂缝产状统计和构造形迹法分析多组裂缝叠加关系,通过碳氧同位素分析、声发射实验等测试手段,厘定露头裂缝的主要造缝期次及应力场演化特征。研究表明:塔西北露头区裂缝可按裂缝走向划分为330°裂缝组系、270°裂缝组系、250°和210°裂缝组系、300°和0°裂缝组系等多个组系,其形成对应加里东中期、加里东晚期—海西早期、海西晚期—印支期、喜山期4个主要构造期次;对比哈拉哈塘油田裂缝发育特征后,明确了其储层主要发育3期构造裂缝,且揭示了多期裂缝的定量分布规律,与成像测井解释的裂缝参数对比,其符合率平均值达到80%。研究结论证实了露头研究对地下储层裂缝期次厘定的有效性,可为塔里木盆地岩溶缝洞型储层的勘探开发提供可靠的地质依据。
Aiming at the challenges of deep burial,complex stages and difficulty in quantitative characterization of fractures in Ordovician carbonate reservoirs in the Tarim Basin,taking typical outcrops in northwestern Tarim as research objects,digital outcrop characterization technology was used to systematically identify and describe fractures.Based on fracture occurrence statistics and structural trace analysis,the superposition relationships of multiple fracture sets were analyzed.Through carbon-oxygen isotope analysis,acoustic emission experiments,other testing methods,the main fracture-forming stages and stress field evolution characteristics of outcrop fractures were determined.The study shows that fractures in the northwestern Tarim outcrop area can be divided into multiple sets based on strike:330°fracture set,270°fracture set,250°and 210°fracture sets,300°and 0°fracture sets,etc.Their formation corresponds to Middle Caledonian,Late Caledonian-Early Hercynian,Late Hercynian-Indosinian,and Himalayan,four main tectonic stages.After comparing the fracture development characteristics of the Halahatang Oilfield,it was clarified that the reservoir mainly develops three stages of tectonic fractures and the quantitative distribution law of multi-stage fractures was revealed.Compared with the fracture parameters interpreted by imaging logging,the average compliance rate reached 80%.The research conclusions confirm the effectiveness of outcrop studies in determining the stages of subsurface reservoir fractures and can provide reliable geological basis for the exploration and development of karst fracture-cavity reservoirs in the Tarim Basin.
作者
杜赫
冯建伟
宛东平
徐守余
邢会林
DU He;FENG Jianwei;WAN Dongping;XU Shouyu;XING Huilin(Ocean University of China,Qingdao,Shandong 266100,China;Functional Laboratory for Marine Mineral Resource Assessment and Exploration Technology,Pilot National Laboratory for MarineScience and Technology(Qingdao),Qingdao,Shandong 266237,China;China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Xinjiang Yaxin Coalbed Methane Investment and Development(Group)Co.,Ltd.,Urumqi,Xinjiang 830011,China;China University of Petroleum(East China),Qingdao,Shandong 266580,China)
出处
《特种油气藏》
北大核心
2025年第6期40-49,共10页
Special Oil & Gas Reservoirs
基金
国家自然科学基金“基于应力-耗能耦合模型的互层型致密砂岩裂缝定量预测研究”(42072234)。
关键词
碳酸盐岩
多期裂缝
裂缝期次
构造演化
构造应力场
奥陶系
塔里木盆地
carbonate rock
multi-stage fractures
fracture stages
tectonic evolution
tectonic stress field
Ordovician
Tarim Basin
