摘要
鄂尔多斯盆地西缘主要发育碳酸盐岩洞穴,颗粒灰岩、生物灰岩、藻灰岩及细晶白云岩是主要成洞基岩。成洞有利条件不仅包括沉积间断、气候、岩性,而且与断裂体系的发育紧密相关,断裂附近是古岩溶洞穴发育的有利场所。古岩溶洞穴由于埋藏较深,钻井和测井是识别其发育程度的主要方法。洞穴堆积物主要为溶塌角砾岩及冲积砂砾岩,发育晶间孔、晶间溶孔、角砾间孔、溶缝和溶洞,因受到洞壁的保护而免受正常压实,是重要的天然气储层。由于鄂尔多斯盆地西缘断裂构造发育,沟通了深部热流体,洞穴堆积物的储集空间受到后期的改造较大,对天然气成藏既有建设性作用,又有不利因素。
The carbonate caves are mainly developed along the Western fringe of E'erduosi Basin and the cave-forming matrix rocks are mainly composed of grain limestones, biogenic limestones, algal limestones and finely crystalline dolostones. The cave-forming conditions not only include sedimentary break, climate and lithologic property, but also are closely related to the development of fault system, the vicinity of fault being beneficial place for the development of paleokarst caves. The drilling and log are the principal ways of identifying their development level because of the paleokarst caves being deeply buried. The cave constructional materials are mainly composed of the solution breccias and alluvial glutenites with a lot of intercrystalline pores, intercrystalline solution pores, inter-breccial pores, solution fractures and solution caves, and they are the important gas reservoirs because of these pores being protected against the normal compaction by cave walls. Owing to the fact that the faulted structures are numerous along the western fringe of the basin, the deep hot fluids being connected, the late transformation of the reservoir rooms in the cave constructional materials was very strong, which possessed both constructive and destructive effects on gas reservoir formation.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第4期27-30,共4页
Natural Gas Industry
