【摘要】：黔中隆起及鄰區(qū)下寒武統(tǒng)牛蹄塘組頁(yè)巖厚度大、有機(jī)碳含量高、熱演化程度高、脆性礦物含量高,具備頁(yè)巖氣成藏的基本地質(zhì)條件,但經(jīng)過多年頁(yè)巖氣勘探實(shí)踐,至今未取得實(shí)質(zhì)性突破,主要受頁(yè)巖氣成藏條件的特殊性控制。在系統(tǒng)分析野外剖面以及黃頁(yè)1井、龍頁(yè)1井、丁山1井等資料的基礎(chǔ)上,重點(diǎn)開展沉積相、頁(yè)巖分布、有機(jī)碳含量、熱演化程度等頁(yè)巖基本地質(zhì)特征和儲(chǔ)集類型、儲(chǔ)集物性及頁(yè)巖含氣性等頁(yè)巖儲(chǔ)層特征的研究,認(rèn)為頁(yè)巖氣成藏條件特殊性主要表現(xiàn)在2個(gè)方面:(1)頁(yè)巖熱演化程度的特殊性,生烴、排烴歷史復(fù)雜,熱演化程度高,不利于頁(yè)巖氣的賦存和富集;(2)儲(chǔ)層特殊性,熱演化史復(fù)雜、成巖作用強(qiáng)導(dǎo)致頁(yè)巖孔隙度較低,尤其有機(jī)孔發(fā)育少且孔徑較小,頁(yè)巖儲(chǔ)集性差。在此基礎(chǔ)上,制定了頁(yè)巖氣選區(qū)評(píng)價(jià)參數(shù)標(biāo)準(zhǔn),評(píng)價(jià)了頁(yè)巖氣富集有利區(qū)。初步明確了黔南坳陷黃平地區(qū)具有構(gòu)造相對(duì)穩(wěn)定、頁(yè)巖埋深適中、有機(jī)質(zhì)熱演化程度相對(duì)較低、保存條件較好及含氣性好等特征,勘探風(fēng)險(xiǎn)程度相對(duì)較低,是黔中隆起及鄰區(qū)頁(yè)巖氣勘探突破的Ⅰ類有利地區(qū);黔西地區(qū)由于成熟度較高,是探索高熱演化條件下頁(yè)巖氣藏的Ⅱ類有利區(qū)。
[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，

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