塔河油田二区东三叠系哈拉哈塘组岩性圈闭识别与评价
发布时间：2018-09-12 16:47
【摘要】：随着塔河油田油气勘探程度的不断加大,再寻找一定规模的构造圈闭油气藏已经非常困难了,隐蔽性油气藏越来越成为关注的主要目标。三叠系哈一段的岩性圈闭勘探程度还比较低,开展岩性圈闭识别与评价研究对后期油气的滚动开发具有重大意义。论文以经典的层序地层学、沉积学、石油地质学基础理论为指导,根据岩心、测井、界面等特征,将哈拉哈塘组分为1个长期旋回(LSC1)和3个中期旋回(TMSC1-TMSC3)。中期旋回TMSC1晚期湖平面上升,主要发育水下分流河道微相,仅保留上升半旋回的正粒序结构。中期旋回TMSC2初期,受构造抬升影响,湖平面下降,砂泥比例减小。中期旋回TMSC3初期,水位较浅,沉积物接近水面,氧化作用比较强烈,形成一套全区可对比的炭质泥岩标志地层,其沉积体系为沼泽湿地,中期旋回TMSC3中后期,构造活动减弱,湖平面上升,湖泊面积增大,主要发育滨浅湖沉积微相。采用地质、地球物理多科学融合的方法,“点”“线”“面”“体”逐次深入,于等时格架中期旋回内开展沉积相研究。中期旋回TMSC1时期,水下分流河道与分流间湾交替发育,以水下分流河道为主;中期旋回TMSC2时期,沉积微相与TMSC1时期相同,但以分流间湾沉积微相为主;中期旋回TMSC3时期发育湿地沼泽、浅湖泥微相。哈拉哈塘组砂体(含油砂体)主要发育于中期旋回TMSC2,多为薄层砂岩(含油砂体)。运用地震属性研究确认平均绝对振幅与中期旋回内砂体(储层)厚度相关性强,能够揭示旋回内砂体展布特征。波阻抗反演剖面不能很好的区分砂岩和泥岩,SP测井曲线响应特征能够敏感的区分砂、泥岩,运用拟声波反演可以很好识别5m以上的砂体,刻画砂体的空间展布形态。综合旋回界面构造解释成果、地震属性成果及拟声波反演成果识别出12个圈闭,其中6个构造-岩性圈闭,6个岩性圈闭。从砂体、盖层封堵性、含油气性、与油源的连通方面综合开展圈闭评价,优选出5个Ⅰ类圈闭和7个Ⅱ类圈闭。其中3个Ⅰ类圈闭钻获油层,另2个Ⅰ类圈闭可作为下一步滚动勘探开发目标。
[Abstract]:With the increasing degree of oil and gas exploration in Tahe Oilfield, it is very difficult to find a certain scale of structural trap reservoir again, and the hidden oil and gas reservoir is becoming the main target of attention. The exploration degree of the lithologic traps in the first member of the Triassic is relatively low, so it is of great significance to develop the identification and evaluation of lithologic traps for the rolling development of oil and gas in the later stage. Based on the basic theories of sequence stratigraphy, sedimentology and petroleum geology, according to the characteristics of core, logging and interface, this paper divides the halahatang component into a long term cycle (LSC1) and three intermediate cycles (TMSC1-TMSC3). The lake level rose in the late TMSC1 period of the middle cycle, mainly developed microfacies of underwater distributary channel, and only the normal grain sequence structure of the ascending semi-cycle was retained. In the early stage of TMSC2, the lake level decreases and the ratio of sand to mud decreases due to tectonic uplift. In the early stage of TMSC3, the water level is shallow, the sediment is close to the water surface, and the oxidation is relatively strong, forming a set of comparable carbonaceous mudstone marker strata in the whole area. Its sedimentary system is a swamp wetland, and the tectonic activity is weakened in the middle and late TMSC3 period of the middle cycle. The lake level rises, the lake area increases, mainly develops the shore shallow lake sedimentary microfacies. By using the method of multi-scientific integration of geology and geophysics, the sedimentary facies are studied in the middle cycle of isochronous frame, in which the "point" line, "surface" and "body" are further studied. In the TMSC1 period of the middle cycle, the subaqueous distributary channel and the interdistributary bay developed alternately, and the sedimentary microfacies in the TMSC2 period of the middle cycle were the same as in the TMSC1 period, but the sedimentary microfacies in the interdistributary bay were the main facies. Wetland swamps and shallow lake mud microfacies were developed in the TMSC3 period of the middle cycle. The sand body (oil sand body) of Hala Hattang formation mainly developed in the middle cycle TMSC2, is mainly thin layer sandstone (oil sand body). Using seismic attribute study, it is confirmed that the mean absolute amplitude has strong correlation with the thickness of sand body (reservoir) in the middle cycle, which can reveal the distribution characteristics of sand body in the cycle. Wave impedance inversion profile can not distinguish sandstone from mudstone SP logging curve response characteristics can be sensitive to distinguish sand mudstone the use of pseudo acoustic inversion can be used to identify sand bodies more than 5 m to depict the spatial distribution of sand body shape. In this paper, 12 traps are identified, including 6 tectonic-lithologic traps and 6 lithologic traps. From the aspects of sand body, sealing property of caprock, oil and gas content, connecting with oil source, the trap evaluation is carried out synthetically, and 5 鈪，
本文编号：2239617
[Abstract]:With the increasing degree of oil and gas exploration in Tahe Oilfield, it is very difficult to find a certain scale of structural trap reservoir again, and the hidden oil and gas reservoir is becoming the main target of attention. The exploration degree of the lithologic traps in the first member of the Triassic is relatively low, so it is of great significance to develop the identification and evaluation of lithologic traps for the rolling development of oil and gas in the later stage. Based on the basic theories of sequence stratigraphy, sedimentology and petroleum geology, according to the characteristics of core, logging and interface, this paper divides the halahatang component into a long term cycle (LSC1) and three intermediate cycles (TMSC1-TMSC3). The lake level rose in the late TMSC1 period of the middle cycle, mainly developed microfacies of underwater distributary channel, and only the normal grain sequence structure of the ascending semi-cycle was retained. In the early stage of TMSC2, the lake level decreases and the ratio of sand to mud decreases due to tectonic uplift. In the early stage of TMSC3, the water level is shallow, the sediment is close to the water surface, and the oxidation is relatively strong, forming a set of comparable carbonaceous mudstone marker strata in the whole area. Its sedimentary system is a swamp wetland, and the tectonic activity is weakened in the middle and late TMSC3 period of the middle cycle. The lake level rises, the lake area increases, mainly develops the shore shallow lake sedimentary microfacies. By using the method of multi-scientific integration of geology and geophysics, the sedimentary facies are studied in the middle cycle of isochronous frame, in which the "point" line, "surface" and "body" are further studied. In the TMSC1 period of the middle cycle, the subaqueous distributary channel and the interdistributary bay developed alternately, and the sedimentary microfacies in the TMSC2 period of the middle cycle were the same as in the TMSC1 period, but the sedimentary microfacies in the interdistributary bay were the main facies. Wetland swamps and shallow lake mud microfacies were developed in the TMSC3 period of the middle cycle. The sand body (oil sand body) of Hala Hattang formation mainly developed in the middle cycle TMSC2, is mainly thin layer sandstone (oil sand body). Using seismic attribute study, it is confirmed that the mean absolute amplitude has strong correlation with the thickness of sand body (reservoir) in the middle cycle, which can reveal the distribution characteristics of sand body in the cycle. Wave impedance inversion profile can not distinguish sandstone from mudstone SP logging curve response characteristics can be sensitive to distinguish sand mudstone the use of pseudo acoustic inversion can be used to identify sand bodies more than 5 m to depict the spatial distribution of sand body shape. In this paper, 12 traps are identified, including 6 tectonic-lithologic traps and 6 lithologic traps. From the aspects of sand body, sealing property of caprock, oil and gas content, connecting with oil source, the trap evaluation is carried out synthetically, and 5 鈪，
本文编号：2239617
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