【摘要】：二疊系碎屑巖儲集層是準噶爾盆地西北緣地區(qū)重要的勘探層位,埋藏深度大,研究其次生孔隙分布及其控制因素是研究區(qū)儲集層研究的一項難點。利用巖芯、鑄體薄片、熒光薄片、掃描電鏡、黏土礦物等資料,結(jié)合沉積相、構(gòu)造演化及有機質(zhì)演化特征,對二疊系碎屑巖次生孔隙發(fā)育控制因素進行了研究。研究結(jié)果表明:二疊系碎屑巖除發(fā)育原生粒間孔外,還發(fā)育顆粒溶孔、膠結(jié)物溶孔及裂縫等次生孔隙。顆粒溶孔、碳酸鹽及沸石膠結(jié)物溶孔主要受烴源巖熱演化產(chǎn)生的有機酸及大氣淡水無機酸作用的范圍、規(guī)�？刂啤o機酸成因的溶孔主要發(fā)育于不整合面和斷裂發(fā)育的盆地邊緣區(qū)域,有機酸成因的次生孔主要發(fā)育于緊臨烴源巖的盆地中部區(qū)域;裂縫主要是在構(gòu)造擠壓應力作用下產(chǎn)生,受構(gòu)造應力大小、巖性粒級及雜基含量控制,主要分布于西北緣逆沖斷裂帶內(nèi)低雜基含量的砂礫巖中。平面分布上,西北緣二疊系碎屑巖儲集空間類型在盆地邊緣以原生粒間孔為主、其次為無機酸成因的溶蝕孔及裂縫;向盆地中部過渡為有機成因的溶孔為主,原生粒間孔次之的儲集空間組合。結(jié)合研究區(qū)沉積相展布、膠結(jié)物分布、構(gòu)造特征及有機質(zhì)演化特征,指出盆地中部的扇三角洲前緣區(qū)帶,濁沸石膠結(jié)物發(fā)育,靠近烴源巖,處于三期有機酸運移的上傾方向,是有利的濁沸石溶蝕孔隙發(fā)育區(qū)帶。
[Abstract]:Permian clastic rock reservoir is an important exploration horizon in the northwest margin of Junggar Basin with large burial depth. It is difficult to study the secondary pore distribution and its controlling factors in the study area. The controlling factors of secondary pore development in Permian clastic rocks were studied by using core, casting, fluorescence, scanning electron microscopy, clay minerals and so on, combined with sedimentary facies, structural evolution and evolution characteristics of organic matter in Permian clastic rocks. The results show that in addition to primary intergranular pores, secondary pores such as granular solution pores, cementation solution pores and fractures are also developed in Permian clastic rocks. Particle pore, carbonate and zeolite cementitious pore are mainly controlled by the range and scale of organic acids produced by thermal evolution of hydrocarbon source rocks and inorganic acids of atmospheric fresh water. The dissolved pores of inorganic acid origin are mainly developed in the unconformable surface and fault-developed basin margin area, while the secondary pores of organic acid origin mainly develop in the central region of the basin adjacent to the source rocks. Fractures are mainly caused by tectonic compressive stress, controlled by the size of tectonic stress, lithologic particle size and heterosis content, and mainly distributed in the sand conglomerate with low hetero-base content in the thrust fault zone of the northwest margin. In plane distribution, the reservoir space type of Permian clastic rocks in the northwest margin is dominated by primary intergranular pores, followed by inorganic acid-based dissolution pores and fractures. The transition to the middle part of the basin is dominated by organic dissolved pores, followed by the reservoir space assemblages of primary intergranular pores. Based on the sedimentary facies distribution, cementitious distribution, structural characteristics and organic matter evolution characteristics of the study area, it is pointed out that the turbidite cements develop in the fan delta front zone in the middle of the basin and are close to the source rocks, and they are in the updip direction of organic acid migration in the third stage. It is a favorable zone of turbidite dissolution pore development.
【作者單位】： 中國石油杭州地質(zhì)研究院;
【基金】：國家重點基礎研究發(fā)展計劃(973計劃)項目(2014CB239002)~~
【分類號】：P618.13

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