Study of reservoir formation conditions and favorable zones selection of the Dawuba Formation in the Ziyun area of Guizhou Province
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摘要: 贵州南部是我国南方上古生界石炭系页岩集中发育的部位,经历了复杂的构造演化及岩相古地理变化,发育了非均质性较强的打屋坝组页岩层系。紫云地区作为贵州南部的典型代表,不同部位打屋坝组页岩的发育情况都不尽相同。通过对紫云地区长页1井、代页1井及周边罗岗、蛮场、四大寨、格凸河等典型露头开展测试分析,从区域构造发育、地层岩性组合、地层厚度与埋深、有机地球化学特征、页岩储层物性及含气性等角度对区内打屋坝组的分布情况及成藏条件进行了分析。研究认为: 紫云地区在石炭纪早期属台地边缘斜坡-台盆相沉积,水体由北向南逐渐变深,富有机质页岩集中在打屋坝组一段和三段,且各层的各项静态指标有利,区内钻井页岩气含气显示良好。通过综合对比评价,在紫云地区优选了宗地、上院2个页岩气有利区,为下一步页岩气勘探指明了方向。Abstract: The southern part of Guizhou Province is the concentration of Upper Paleozoic Carboniferous shales in southern China, where has undergone complex tectonic evolution and petrographic paleogeographic changes. Therefore, the inhomogeneous shale system of the Dawuba Formation is developed. As a typical representative of Ziyun area in southern Guizhou Province, the development of shales in Dawuba Formation varies from region to region. In this paper, the authors studied distribution and reservoir formation conditions of the Dawuba Formation from perspectives of regional tectonic development, formation lithology combination, formation thickness and burial depth, organic geochemical characteristics, shale reservoir physical properties and gas-bearing properties through well CY1, well DY1, and the surrounding outcrops in Luogang Manchang, Sidazhai, and Getuhe area. The results show that Ziyun area was deposited in the slope-pelagic phase at the edge of Early Carboniferous, and the water body gradually becomes deeper from north to south. And the organic-rich shales are concentrated in the I and III section of Dawuba Formation with favorable static indicators of each section, while the drilling wells in this area show good gas content. Through comprehensive comparison and evaluation, two favorable shale gas zones of Zongdi and Shangyuan in Ziyun area were selected, providing next direction for shale gas exploration in this area.
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Key words:
- Ziyun area /
- Carboniferous /
- Dawuba Formation /
- reservoir formation conditions /
- favorable zone
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