塔里木盆地雅克拉斷凸東部含氣性檢測與非構造圈閉分析
發(fā)布時間：2018-08-17 17:31
【摘要】：位于塔里木盆地北部的沙雅隆起雅克拉斷凸是天然氣勘探重點區(qū)域。此次研究的庫車、輪臺三維地震區(qū)位于庫車坳陷南部前緣斜坡帶,沙雅隆起雅克拉斷凸東部。該區(qū)背斜構造發(fā)育,生儲蓋條件較好,已發(fā)現(xiàn)多個構造圈閉油氣藏。但隨著勘探工作的逐漸深入,研究區(qū)大中型構造圈閉基本勘探完畢,非構造油氣藏勘探成為一個重要方向。本文以巖心、測井、鉆井及三維地震資料為基礎,利用地震波高頻含氣衰減原理,在離散頻率域內對地震資料進行分頻衰減特征分析。將地震勘探方法與地質學理論相結合,通過與石油地質條件的綜合對比識別和評價含氣異常區(qū),深入探討了研究區(qū)內下古生界寒武系、中生界侏羅系和新生界古近系氣藏存在的可能性,取得了以下成果和認識:輪臺三維地震區(qū)北部侏羅系超覆斜坡帶最厚處約300米,不發(fā)育背斜構造。用含氣檢測方法共發(fā)現(xiàn)兩個含氣異常區(qū)。1號異常區(qū)面積約20 km2,呈橢圓狀分布,異常值較高,約10-20 (無量綱),表明了該異常區(qū)良好的含氣潛力;2號異常區(qū)位于1號異常區(qū)南部,面積約10 km2,呈條帶狀分布,異常值8-15 (無量綱),該含氣異常區(qū)與地震屬性顯示的地層和砂體展布范圍一致,準確性較高。綜合考慮不整合面上地層超覆和上傾尖滅及石油地質條件,認為1號異常區(qū)可能為巖性上傾尖滅氣藏,2號異常區(qū)可能為地層超覆氣藏。庫車三維地震區(qū)下古生界海相寒武系碳酸鹽巖廣泛發(fā)育,儲層類型以溶蝕孔洞為主。該區(qū)檢測發(fā)現(xiàn)3號含氣異常區(qū),面積約10km2,異常值約14-20 (無量綱),異常范圍北部邊界受斷裂控制,與斷裂延伸方向基本一致,屬于構造-巖性圈閉氣藏。庫車三維區(qū)新生界庫姆格列木群砂體廣泛分布,分頻含氣衰減方法所檢測異常區(qū)位于河道砂體分布區(qū)域,與斷裂、構造線等無明顯關系,通過與石油地質條件綜合分析,認為該區(qū)異常可能由低速膏鹽巖或者砂巖少量含氣引起,不具備成藏條件。此次研究提出了一種新的非構造圈閉預測方法,實際資料的對比分析顯示其可信度較高,對今后的非構造圈閉油氣勘探可以提供一定幫助。
[Abstract]:The Jacques uplift protruding in the northern Tarim Basin is the key area for natural gas exploration. The three dimensional seismic zone of Kuqa and Luntai in this study is located in the front slope zone of Kuqa depression in the eastern part of the Yak-pull uplift of Shaya uplift. The anticline is well developed, and several structural traps have been discovered. However, with the deepening of exploration work, the exploration of large and medium-sized structural traps is basically completed in the study area, and the exploration of non-structural oil and gas reservoirs becomes an important direction. Based on the core, logging, drilling and 3D seismic data, the attenuation characteristics of seismic data in discrete frequency domain are analyzed by using the principle of high frequency gas-bearing attenuation of seismic wave. Combining seismic exploration method with geological theory, the lower Paleozoic Cambrian in the study area is deeply discussed through the comprehensive comparison with petroleum geological conditions to identify and evaluate the gas bearing anomaly area. The possibility of the existence of Mesozoic Jurassic and Cenozoic Paleogene gas reservoirs has been obtained as follows: the Jurassic overlying slope zone in the northern part of Luntai seismic area is about 300 meters thick and the anticline structure is not developed. Two abnormal gas bearing regions were found by gas detection method. The area of anomaly area 1 is about 20 km ~ 2, with an ellipsoidal distribution, and the abnormal value is about 10-20 (dimensionless), which indicates that the anomaly area has good gas-bearing potential, and anomaly area No. 2 is located in the south of anomaly area No. 1. The area is about 10 km ~ 2, and the abnormal value is 8-15 (dimensionless). The gas bearing anomaly area is consistent with the distribution range of strata and sand bodies shown by seismic attributes, and the accuracy is high. Considering the stratigraphic overlying, updip pinning and petroleum geological conditions on the unconformity surface, it is considered that the No. 1 anomaly area may be lithologic updip pinnacle gas reservoir, and the No. 2 anomaly area may be stratigraphic overlying gas reservoir. The Lower Paleozoic marine Cambrian carbonate rocks are widely developed in Kuqa three dimensional seismic area. The gas bearing anomaly area No. 3 is found in this area, with an area of about 10 km ~ 2 and an anomaly value of 14-20 (dimensionless). The northern boundary of the anomaly is controlled by the fault, which is basically consistent with the extension direction of the fault and belongs to the tectonic-lithologic trap gas reservoir. In Kuqa three-dimensional area, the sand bodies of the Cenozoic Kumgarimu group are widely distributed, and the abnormal areas detected by the method of gas attenuation with frequency distribution are located in the distributional area of channel sand bodies, which have no obvious relationship with faults and structural lines, etc. Through comprehensive analysis with petroleum geological conditions, It is considered that the anomaly in this area may be caused by low velocity gypsum salt rock or sandstone with a small amount of gas, which is not suitable for reservoir formation. In this study, a new method for prediction of non-structural traps is proposed. The comparative analysis of actual data shows that the method is highly reliable, which may be helpful to the exploration of non-structural traps in the future.
【學位授予單位】：西北大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13
本文編號：2188375
[Abstract]:The Jacques uplift protruding in the northern Tarim Basin is the key area for natural gas exploration. The three dimensional seismic zone of Kuqa and Luntai in this study is located in the front slope zone of Kuqa depression in the eastern part of the Yak-pull uplift of Shaya uplift. The anticline is well developed, and several structural traps have been discovered. However, with the deepening of exploration work, the exploration of large and medium-sized structural traps is basically completed in the study area, and the exploration of non-structural oil and gas reservoirs becomes an important direction. Based on the core, logging, drilling and 3D seismic data, the attenuation characteristics of seismic data in discrete frequency domain are analyzed by using the principle of high frequency gas-bearing attenuation of seismic wave. Combining seismic exploration method with geological theory, the lower Paleozoic Cambrian in the study area is deeply discussed through the comprehensive comparison with petroleum geological conditions to identify and evaluate the gas bearing anomaly area. The possibility of the existence of Mesozoic Jurassic and Cenozoic Paleogene gas reservoirs has been obtained as follows: the Jurassic overlying slope zone in the northern part of Luntai seismic area is about 300 meters thick and the anticline structure is not developed. Two abnormal gas bearing regions were found by gas detection method. The area of anomaly area 1 is about 20 km ~ 2, with an ellipsoidal distribution, and the abnormal value is about 10-20 (dimensionless), which indicates that the anomaly area has good gas-bearing potential, and anomaly area No. 2 is located in the south of anomaly area No. 1. The area is about 10 km ~ 2, and the abnormal value is 8-15 (dimensionless). The gas bearing anomaly area is consistent with the distribution range of strata and sand bodies shown by seismic attributes, and the accuracy is high. Considering the stratigraphic overlying, updip pinning and petroleum geological conditions on the unconformity surface, it is considered that the No. 1 anomaly area may be lithologic updip pinnacle gas reservoir, and the No. 2 anomaly area may be stratigraphic overlying gas reservoir. The Lower Paleozoic marine Cambrian carbonate rocks are widely developed in Kuqa three dimensional seismic area. The gas bearing anomaly area No. 3 is found in this area, with an area of about 10 km ~ 2 and an anomaly value of 14-20 (dimensionless). The northern boundary of the anomaly is controlled by the fault, which is basically consistent with the extension direction of the fault and belongs to the tectonic-lithologic trap gas reservoir. In Kuqa three-dimensional area, the sand bodies of the Cenozoic Kumgarimu group are widely distributed, and the abnormal areas detected by the method of gas attenuation with frequency distribution are located in the distributional area of channel sand bodies, which have no obvious relationship with faults and structural lines, etc. Through comprehensive analysis with petroleum geological conditions, It is considered that the anomaly in this area may be caused by low velocity gypsum salt rock or sandstone with a small amount of gas, which is not suitable for reservoir formation. In this study, a new method for prediction of non-structural traps is proposed. The comparative analysis of actual data shows that the method is highly reliable, which may be helpful to the exploration of non-structural traps in the future.
【學位授予單位】：西北大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13
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