查干凹陷早白垩世热流体活动的证据及其对巴音戈壁组碎屑岩储层的影响

发布时间：2018-03-23 03:30

本文选题：碳、氧同位素　切入点：溶蚀作用　出处：《石油与天然气地质》2017年02期 　论文类型：期刊论文

【摘要】：基于沉积、储层和构造特征,应用流体包裹体和碳、氧同位素等技术手段,结合岩心、薄片及扫描电镜观察,发现查干凹陷早白垩世苏红图组沉积时期为走滑-拉分断陷期,伴随多期中-基性安山岩和玄武岩为主的火山活动及其对应的热流体活动。苏红图期火山喷发及热流体活动,影响了巴音戈壁组埋深2 800 m以下地层,主要体现在古大地热流异常高值、包裹体均一温度异常增高、碳同位素显示无机成因特征、镜质体反射率突变及粘土矿物转化异常这5个方面。深部的热流体携带CO2等气体,主要沿毛西断裂上侵,进入乌力吉构造带,通过微裂缝和不整合面等通道发生横向运移,主要溶蚀巴音戈壁组储层碳酸盐等矿物,其次为长石颗粒。溶蚀作用发育的优先部位,主要在靠近控制岩浆侵入体的深大断裂,其次受不整合面及次级断裂和裂缝等控制;向凹陷内部,溶蚀作用减弱。深部热流体活动对区内有机质热演化和储层物性的影响,是研究区内溶蚀孔洞发育及分布的主控因素,也是勘探大规模油气藏的关键。
[Abstract]:Based on the sedimentary, reservoir and tectonic characteristics, fluid inclusions and carbon, oxygen isotope techniques, combined with core, thin section and scanning electron microscope observation, found in Chagan Depression of Early Cretaceous Suhongtu formation sedimentary period for strike slip pull apart rift period, with the thermal fluid activity - based multi period of Anshan rock and basalt volcano activity and its corresponding. Suhongtu period and volcano thermal fluid activities affecting the Bayin Gobi formation depth of 2800 m below the stratum, mainly reflected in high value flow anomaly paleoheat, abnormal increase of homogenization temperature, carbon isotopes show inorganic characteristics, vitrinite reflectance and mutation this abnormal transformation of clay minerals in 5 aspects. The deep thermal fluid carrying CO2 gas, mainly along the Maoxi fault invasion into the Uligi tectonic belt and unconformity, through channels such as micro cracks occur lateral migration, the main corrosion Zongbayin Ge Wall formation reservoir of carbonate minerals such as feldspar particles. Secondly, preferable site denudation, deep faults near the main control magma, followed by unconformity and secondary fracture and crack control; to sag, dissolution decreased. Effects of deep thermal fluid activity on organic matter thermal zone the evolution and reservoir of the study area, is a karst cave developing and controlling the distribution of factors, is also the key of large-scale exploration of oil and gas reservoirs.

【作者单位】：中国石油大学(北京)地球科学学院;中国石油大学(北京)油气资源与探测国家重点实验室;中国石化中原油田分公司石油勘探开发研究院;中国石油大庆油田采油三厂电力大队;
【基金】：国家油气重大专项(2011ZX05001-002)
【分类号】：P618.13

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