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塔中西部地区覆于海相东河砂岩储层之上的下二叠统地层中广泛发育火成岩,并具有以火山口为中心向四周辐射分布的特征。离火山口越近,发育厚度越大;离火山口较近处主要发育喷发岩,较远处则发育凝灰岩等。该区与火成岩有关的东河砂岩圈闭可分为三种类型,即火成岩刺穿型圈闭、与火成岩冷却有关的小型圈闭及火成岩侧向封堵圈闭。其中仅后一种圈闭有利于油气藏的形成。火成岩体为地震高速异常体,它可以引起下伏地震反射界面上拉,造成假构造。对TZ21井过井剖面建立了地质模型,并用不同的火成岩厚度进行了实验;根据实验结果建立了塔中西部地区火成岩地震假构造校正模板;根据该模板校正设计了TZ39井,证实校正效果较为理想。实验结果显示,厚度较大的火成岩体才会对地震反射界面的同相轴产生明显影响,薄层的火山岩体,如小于100m,则一般不会产生假构造。
In the middle and lower part of the tower, the igneous rocks are extensively developed in the Lower Permian strata overlying the marine sandstone reservoirs in the East River and have the characteristics of radiating around the crater. The closer to the crater, the greater the thickness of development; the crater is mainly developed near the crater, while the tuff is developed further away. The Donghe sandstone traps associated with igneous rocks in this area can be divided into three types, that is, the igneous-diagenetic-type traps, the small traps associated with igneous rock cooling, and the lateral sealing of igneous rocks. Only the latter trap is conducive to the formation of oil and gas reservoirs. The igneous body is a high-speed seismic anomaly, which can cause the underlying seismic reflection interface to pull up and cause fake structure. Based on the experimental results, the tectonic correction template of igneous rocks in western Tazhong area was established. Based on this template, a well TZ39 was designed and calibrated to verify that the correction effect is satisfactory . The experimental results show that the larger igneous rocks will have a significant impact on the seismic reflection interface of the phase axis, thin volcanic rocks, such as less than 100m, the general will not produce fake structure.