【摘要】：基于全盆地野外露頭、鉆井、地震資料及地球化學(xué)分析數(shù)據(jù),研究了松遼盆地深層地質(zhì)結(jié)構(gòu)特征、斷陷基本地質(zhì)規(guī)律、沙河子組致密氣成藏地質(zhì)條件及下步勘探方向。通過系統(tǒng)對比分析,明確盆地深層地質(zhì)結(jié)構(gòu)表現(xiàn)為下斷上坳的雙層結(jié)構(gòu),斷陷期以斷裂或地層超覆與隆(凸)起為界、由隆(凸)起相互間隔的斷陷獨(dú)立發(fā)育。與斷陷形成演化相關(guān)的斷裂可分為區(qū)域深大斷裂、基底控陷斷裂和洼內(nèi)次級斷裂3類,闡明了3類斷裂在斷陷群形成演化中的作用。結(jié)合區(qū)域構(gòu)造和盆地演化特征分析,明確致密砂礫巖氣、火山巖和基巖潛山等3大勘探領(lǐng)域,沙河子組致密砂礫巖氣是目前最具勘探前景的戰(zhàn)略新領(lǐng)域。在沙河子組基本石油地質(zhì)特征分析基礎(chǔ)上,提出砂礫巖是沙河子組碎屑巖儲集層優(yōu)勢巖類,母巖成分、沉積結(jié)構(gòu)、沉積相帶及成巖作用是砂礫巖有利儲集層主控因素。沙河子組氣藏屬典型自生自儲型,發(fā)育巖性和構(gòu)造兩種氣藏類型,陡緩兩帶有利沉積相帶控制儲集層展布、巖性圈閉形成及氣藏規(guī)模,斷陷內(nèi)部次級斷裂控制構(gòu)造圈閉的形成及天然氣的富集。通過綜合評價優(yōu)選出7個沙河子組致密砂礫巖氣勘探最為現(xiàn)實(shí)的斷陷。
[Abstract]:Based on the field outcrop, drilling, seismic data and geochemical analysis data of the whole basin, the characteristics of deep geological structure of Songliao Basin, the basic geological law of fault depression, the geological conditions of tight gas reservoir formation in Shahezi formation and the next exploration direction are studied. Through systematic comparison and analysis, it is clear that the deep geological structure of the basin is a double-layer structure of the lower fault-upper depression. The fault-depression period is bounded by faults or strata overburden and uplift (uplift), and develops independently from uplift (uplift) to each other. The faults related to the formation and evolution of fault depression can be divided into three types: regional deep and large faults, basement controlled faults and subsag secondary faults. The role of the three types of faults in the formation and evolution of fault depression groups is clarified. Based on the analysis of regional structure and basin evolution characteristics, it is clear that tight sand-gravel gas, volcanic rock and bedrock buried hill are three major exploration fields. Tight sand-gravel gas in Shahezi formation is the most promising strategic field at present. Based on the analysis of the basic petroleum geological characteristics of the Shahezi formation, it is suggested that the sand conglomerate is the dominant rock group in the clastic reservoir of the Shahezi formation, the parent rock composition, the sedimentary structure, the sedimentary facies zone and the diagenesis are the main controlling factors of the favorable reservoir in the Shahezi formation. The gas reservoir of Shahezi formation belongs to the typical self-generating and self-storage type, which develops two types of gas reservoirs, lithologic trap formation and gas reservoir scale, and the lithologic trap formation and gas reservoir scale are controlled by the favorable sedimentary facies zone of steep and slow two zones. The secondary faults in the fault depression control the formation of structural traps and the enrichment of natural gas. Through comprehensive evaluation, the most realistic fault depression for gas exploration of tight sand-gravel rock in Shahezi formation has been selected.
【作者單位】： 中國地質(zhì)大學(xué)(北京)海洋學(xué)院;中國石油勘探開發(fā)研究院廊坊分院;
【基金】：國家自然科學(xué)基金項(xiàng)目(40772075) 國家重大科技專項(xiàng)(2011ZX05007)
【分類號】：P618.13

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