IOCAS-IR  > 海洋地质与环境重点实验室
南海北部深水盆地浅水流的地球物理识别特征及成因机制
其他题名Geophysical identification characteristics and genetic mechanism of shallow water flow in deepwater basin of northern South China Sea
谢杨冰
学位类型硕士
导师吴时国
2017-05
学位授予单位中国科学院大学
学位授予地点北京
学位专业海洋地质
关键词正常压实 超压 浅水流 南海北部 深水盆地
摘要南海北部深水盆地油气资源已成为我国油气勘探开发的一大热点。然而,深水地质灾害问题是影响深水油气勘探开发的重要因素,如浅水流、浅层气、海底滑坡、天然气水合物分解等。浅水流灾害是深水油气钻井中常见的深水地质灾害,在钻井过程中遇到会出现井漏、井喷,甚至引发平台不稳定至坍塌。因此,预测和避开深水油气开发过程中的地质灾害势在必行。论文选取南海深水盆地ODP184航次1144、1146、1148站位与IODP349航次U1431、U1432、U1433、U1435站位与X1钻井的测井数据,结合地震资料开展南海北部深水盆地的超压和浅水流地球物理识别和成因机制研究。
为获取可靠的预测超压结果,研究了南海深水盆地正常压实沉积物的影响因素。分析南海深水盆地沉积物正常压实系数与沉积物组分、沉积速率、沉积物埋深等多个影响因素的关系,揭示南海深水盆地不同深度沉积物正常压实系数与初始孔隙度的变化规律。
利用分析后可靠的拟合后正常压实系数进行钻井超压计算预测,分析南海北部深水盆地的超压地球物理特征和成因机制。通过超压的预测与分析进一步进行南海北部深水盆地超压浅水流砂体的预测,结合超压浅水流砂体所在地震剖面资料,分析浅水流砂体的地球物理属性识别方法。根据区域地质背景、钻井资料与地震资料解释,分析南海北部深水盆地浅水流砂体的成因机理。并提出了对浅水流这一深水钻井浅层地质灾害的预测预防方法。
其他摘要The oil and gas resources in deep-water basin of northern South China Sea has become a hotspot in the field of oil and gas exploration in our country. However, deep-water geohazards, such as shallow water flow, shallow gas, submarine landslides and gas hydrate decomposition et al., are the important factors for oil and gas exploration in deep-water basin. Shallow water flow is a common deep-water geohazards in deep-water drilling, it will cause leakages, blowouts, platform instability and collapse. Therefore, geohazards prediction and avoidance in deep-water oil and gas exploration is imperative. Using the Well-logging data of the ODP Leg 184 Site 1144, 1146, 1148, the IODP Leg 349 Site U1431, U1432, U1433, U1435 and Well X1 in deep-water basin of northern South China Sea, to research the geophysical identification and formation mechanisms of overpressure and shallow water flow combine with seismic profiles.
In order to obtain the reliable results of calculated overpressure, we research the affect factors of normal compaction sediments in deep-water basin of South China Sea. Analyze the relationships between the normal compaction and the sediments contents, deposition rates, burial depth et al. in deep-water basin of South China Sea. Reveal a primary variation discipline of the coefficients of normal compaction and mudline porosity in different depth in deep-water basin of South China Sea.
Calculate the overpressure in Wells by fitted normal compaction coefficient which is reliable. Analyze the geophysical characteristics and formation mechanisms of overpressure in deep-water basin of northern South China Sea. Predict the overpressured shallow water flow sands in deep-water basin of northern South China Sea based on the overpressure prediction and analysis. Analyze the geophysical characteristics of shallow water flow sands with seismic profiles across the overpressured shallow water flow sands. Analyze the formation mechanisms of shallow water flow sands in deep-water basin of northern South China Sea according to the regional geological setting, Well-logging data and seismic profiles. Offer some methods for prediction and prevention from deep-water geohazards in deep-water drilling of shallow water flow.
学科领域海洋地质学
语种中文
文献类型学位论文
条目标识符http://ir.qdio.ac.cn/handle/337002/136630
专题海洋地质与环境重点实验室
作者单位1.中国科学院海洋研究所
2.中国科学院大学
推荐引用方式
GB/T 7714
谢杨冰. 南海北部深水盆地浅水流的地球物理识别特征及成因机制[D]. 北京. 中国科学院大学,2017.
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