陕甘宁盆地中部大气田成藏条件分析

陕甘宁盆地大气田的发现既是天然气勘探上的突破又是对盆地天然气成藏条件认识上的转折，认识到受风化侵蚀的古台地才是盆地天然气勘探的目标。气田主要边界受夹持古台地的沟槽发育的控制：沟槽中早期充填石炭系煤系地层并成为煤成气向古台地溶孔运移的通道，燕山运功后，台地东侧的沟槽抬升成为天然气向东运移的天然屏障。文中论述了中部大气田两套气源岩、岩相与岩溶、风化壳地貌及靖边气田成藏、形成高产区的基本地质条件。最后对勘探远景作出评价。     

八面河油田西区沙四段滩坝砂体分布规律

滩坝砂体储层薄,横向变化快,常规方法预测难度大。通过沉积旋回、古湖岸线(隆起)走向、宏观及微观古地形来预测滩坝主体的发育位置。     

色力布亚地区T8波组及地震异常体的地质解释

T₈反射波组是塔里木盆地色力布亚地区最显著和最稳定的地震反射层宇之一, 可分为强振幅高连续多相位、强振幅高连续汉相位和中振幅中连续减薄尖灭三种地震相类型, 地质层位归属下第三系, 气映了一套以泻湖相石膏及膏泥岩为主的沉积, 色力布亚西南部则可能发育正常的海相灰岩。T₈波组中的地震异常反射, 依据外形可分为丘状、透镜状和滩状, 其农因可归结为方地貌响应、岩性响应和断层响三个方面。T₈层序不具备有利的储集条件。而可作为良好的区域性盖层。     

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塔里木盆地碳酸盐岩岩溶型储集层具有埋藏深、非均质性强的特点，利用某种单一技术很难对岩溶型储集层进行较为准确的预测。文章针对碳酸盐岩岩溶型储集层发育和分布的特点，对其在地震资料上的响应特征进行深入的分析；然后应用地震属性参数分析、古地貌恢复、应变量分析裂缝预测、井约束条件下的全三维波阻抗反演等技术方法进行预测分析，认为在地震属性上低相干、强振幅、振幅横向变化率较大、古地貌斜坡部位及古水系两侧、高应变量及裂缝密度较高的区域为碳酸盐岩岩溶发育区；最后利用以上属性参数进行多参数融合，对碳酸盐岩岩溶型储集层进行综合预测评价，划分出有利和较有利的岩溶发育区带，指导井位部署和储量计算等工作。通过多口井的实际钻探结果表明，储层预测评价结果是较为可靠的，并为井位部署和储量计算提供了可靠的地质依据。     

Reconstruction of hillslope and valley paleotopography by application of a geomorphic model

Many applications in geology require estimation of the depth and thickness of lithologic layers based on limited observations. The boundaries of such layers are typically estimated using Kriging or other estimation methods that produce smooth surfaces. In some cases, however, smooth surfaces may be inappropriate. A boundary that is formed by a preserved hillslope and valley paleotopography, in particular, is expected to exhibit drainage characteristics and inherent roughness that are not consistent with standard estimation methods. This paper discusses the generalization of a technique originally designed to interpolate fluvially eroded topography. The method incorporates a simple river basin evolution model to generate realistic topography and adjusts an erodability parameter in space to match observed elevations. The method is generalized to allow flow to enter from outside the interpolation region, which is a likely scenario when reconstructing paleotopography. The method is then applied to the lower boundary of the Tshirege Member of the Bandelier Tuff, which underlies Los Alamos National Laboratory and Bandelier National Monument in north–central New Mexico. The method produces surfaces with major valleys that are consistent with previous studies. The method is also applied in a framework that estimates the likelihood that any particular point within the interpolation region drains through a specified boundary. Although the surfaces vary between simulations, most portions of the interpolation domain drain through consistent boundaries.