黔中隆起及邻区下寒武统页岩气成藏特殊性分析
发布时间：2019-03-13 20:55
【摘要】：黔中隆起及邻区下寒武统牛蹄塘组页岩厚度大、有机碳含量高、热演化程度高、脆性矿物含量高,具备页岩气成藏的基本地质条件,但经过多年页岩气勘探实践,至今未取得实质性突破,主要受页岩气成藏条件的特殊性控制。在系统分析野外剖面以及黄页1井、龙页1井、丁山1井等资料的基础上,重点开展沉积相、页岩分布、有机碳含量、热演化程度等页岩基本地质特征和储集类型、储集物性及页岩含气性等页岩储层特征的研究,认为页岩气成藏条件特殊性主要表现在2个方面:(1)页岩热演化程度的特殊性,生烃、排烃历史复杂,热演化程度高,不利于页岩气的赋存和富集;(2)储层特殊性,热演化史复杂、成岩作用强导致页岩孔隙度较低,尤其有机孔发育少且孔径较小,页岩储集性差。在此基础上,制定了页岩气选区评价参数标准,评价了页岩气富集有利区。初步明确了黔南坳陷黄平地区具有构造相对稳定、页岩埋深适中、有机质热演化程度相对较低、保存条件较好及含气性好等特征,勘探风险程度相对较低,是黔中隆起及邻区页岩气勘探突破的Ⅰ类有利地区;黔西地区由于成熟度较高,是探索高热演化条件下页岩气藏的Ⅱ类有利区。
[Abstract]:The lower Cambrian Niutangtang formation in central Guizhou and adjacent areas is characterized by large shale thickness, high organic carbon content, high thermal evolution, high brittle mineral content, and basic geological conditions for shale gas reservoir formation, but after many years of shale gas exploration practice, Up to now, no substantive breakthrough has been achieved, which is mainly controlled by the particularity of shale gas reservoir-forming conditions. On the basis of systematic analysis of field profile and data of wells Huangzhan1, Longshan1 and Dingshan 1, the basic geological characteristics and reservoir types of shale, such as sedimentary facies, shale distribution, organic carbon content, thermal evolution degree, etc., are carried out. The characteristics of shale reservoir, such as reservoir physical property and shale gas bearing property, are studied. It is considered that the particularity of shale gas reservoir forming conditions is mainly manifested in two aspects: (1) the particularity of thermal evolution degree of shale, hydrocarbon generation, hydrocarbon expulsion history and high thermal evolution. Unfavorable to the occurrence and enrichment of shale gas; (2) Reservoir particularity, complex thermal evolution history and strong diagenesis lead to lower porosity of shale, especially few organic pores and smaller pore size, and poor reservoir ability of shale. On this basis, the criteria of shale gas selection evaluation parameters are established, and the favorable areas for shale gas enrichment are evaluated. It is preliminarily clear that Huangping area of Qiannan depression is characterized by relatively stable structure, moderate buried depth of shale, relatively low degree of thermal evolution of organic matter, good preservation conditions and good gas content, and relatively low exploration risk. It is the type I favorable area for shale gas exploration breakthrough in the central Guizhou uplift and adjacent areas. Due to its high maturity, the west Guizhou area is a favorable type 鈪，
本文编号：2439696
[Abstract]:The lower Cambrian Niutangtang formation in central Guizhou and adjacent areas is characterized by large shale thickness, high organic carbon content, high thermal evolution, high brittle mineral content, and basic geological conditions for shale gas reservoir formation, but after many years of shale gas exploration practice, Up to now, no substantive breakthrough has been achieved, which is mainly controlled by the particularity of shale gas reservoir-forming conditions. On the basis of systematic analysis of field profile and data of wells Huangzhan1, Longshan1 and Dingshan 1, the basic geological characteristics and reservoir types of shale, such as sedimentary facies, shale distribution, organic carbon content, thermal evolution degree, etc., are carried out. The characteristics of shale reservoir, such as reservoir physical property and shale gas bearing property, are studied. It is considered that the particularity of shale gas reservoir forming conditions is mainly manifested in two aspects: (1) the particularity of thermal evolution degree of shale, hydrocarbon generation, hydrocarbon expulsion history and high thermal evolution. Unfavorable to the occurrence and enrichment of shale gas; (2) Reservoir particularity, complex thermal evolution history and strong diagenesis lead to lower porosity of shale, especially few organic pores and smaller pore size, and poor reservoir ability of shale. On this basis, the criteria of shale gas selection evaluation parameters are established, and the favorable areas for shale gas enrichment are evaluated. It is preliminarily clear that Huangping area of Qiannan depression is characterized by relatively stable structure, moderate buried depth of shale, relatively low degree of thermal evolution of organic matter, good preservation conditions and good gas content, and relatively low exploration risk. It is the type I favorable area for shale gas exploration breakthrough in the central Guizhou uplift and adjacent areas. Due to its high maturity, the west Guizhou area is a favorable type 鈪，
本文编号：2439696
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