| 杨岩,张波,李超,张晋言,许孝凯,陈浩,王秀明.井外溶洞储层的偶极横波反射特征研究*[J].,2020,39(1):54-62 |
| 井外溶洞储层的偶极横波反射特征研究* |
| Study on dipole shear wave reflection characteristics of out-well karst cave reservoir |
| 投稿时间：2019-09-29 修订日期：2019-12-24 |
| 中文摘要: |
| 溶洞型储层是油气田中比较典型的储层之一,其非均质性强,勘探开发难度较大,偶极横波远探测技术是目前探测井外溶洞的有效方法。碳酸盐岩溶洞模型正演模拟对于现场的油气勘探和资料解释具有指导性作用。本文建立了几种比较典型的溶洞模型,并通过有限差分方法对溶洞储层的偶极三维反射声场进行了研究,发现在小源距范围内可以接收到来自溶洞后壁较强的反射波,随着源距的增大,该反射波逐渐减弱至消失；对于缝洞结合体的反射波场,来自裂缝的反射波能量要强于来自溶洞的反射波,且来自裂缝的反射波会掩盖溶洞前壁的反射波信息,这对后期的成像处理带来了困难。最后进一步研究了偶极远探测技术在溶洞方位识别以及尺寸大小估算中的应用。 |
| 英文摘要: |
| Karst cave reservoir is one of the typical reservoirs in oil and gas fields. It is strongly heterogeneous and difficult to develop. Dipole shear wave remote detection technology is an effective method to detect out-of-well karst caves. Forward modeling of carbonate karst cave model plays a guiding role in field oil and gas exploration and data interpretation. In this paper, several typical karst cave models are established, and the three-dimensional dipole reflected wave field of karst cave reservoir is studied by FDTD. It is found that strong reflection wave from the back wall of karst cave can be received within a small source distance. With the increase of source distance, the reflection wave gradually weakens to disappear. The reflected wave energy from the crack is stronger than that from the cave, and the reflected wave from the crack will cover up the reflection wave information from the front wall of the cave, which brings difficulties to the later imaging processing. Finally, the application of dipole remote detection technology in the orientation identification and size estimation of karst caves is further studied. |
| DOI：10.11684/j.issn.1000-310X.2020.01.007 |
| 中文关键词: 溶洞储层 反射波场 有限差分 方位识别 |
| 英文关键词: Karst cave reservoirs reflected wave field FDTD orientation identification |
| 基金项目:(11574347, 11774373, 11734017, 91630309) |
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