伊通盆地西北缘鹿乡—岔路河断陷成藏条件研究

发布时间：2019-01-07 07:33

【摘要】：伊通盆地沿北东向纵贯吉林省的中部,位于长春和吉林两地之间,是吉林省境内的狭长断陷盆地。其地质条件复杂,烃源岩厚度大、质量好,储层发育,盆地演化后期的挤压作用使伊通盆地成为富油气资源盆地,勘探潜力较大。由于伊通盆地西北缘鹿乡-岔路河断陷地震资料为90年代末采集,资料品质较差,随着勘探程度的提高,老探区的资料品质不足以满足现代勘探要求,因此寻找新的分析技术,应用新的技术手段对老探区资料进行重新解释对伊通盆地能否再次勘探大发现具有举足轻重的作用。伊通盆地西北缘鹿乡-岔路河断陷构造复杂、地层倾角变化大,地震资料信噪比低,成像质量较差,扇体刻画存在一定的难度。针对以上问题,本文通过应用VSP非零偏地震新技术,古地貌分析技术等,通过地震资料与测井资料相结合识别构造样式,进行扇体刻画、预测有利储层,进而研究伊通盆地西北缘鹿乡-岔路河断陷成藏条件。研究结果表明,岔路河断陷万昌地区西北缘受走滑挤压构造应力影响,具有较好的成藏构造背景,该地区发育双阳组、奢岭组和永吉组三套烃源岩,处于成熟-高成熟阶段,区内普遍发育万昌组扇三角洲砂体,埋深较浅,具有较好储集条件,齐家组泥岩为良好的区域盖层、万昌组二段和万昌组三段的层内泥岩为良好的直接盖层,多条断裂沟通了下部烃源岩,可形成下生上储的岩性-构造油气藏,油藏体现出远源、两期成藏的特点;岔路河断陷西北缘昌40-昌48井区,双阳组一段为主要烃源岩,烃源岩埋藏较深且烃源岩成熟度达到成熟-过成熟阶段,双阳组二段发育大型近岸水下扇,砂岩储层物性好,是良好的储集层,双阳组三段湖进形成大套灰黑色泥岩是良好的区域性盖层,伸展阶段生成的油气经断层运移到双阳组二段近岸水下扇中,形成断层-岩性油气藏,油藏体现出近源、多期成藏的特点。鹿乡断陷断受控藏逆冲断层限制呈狭长形延伸,烃源岩主要为双阳组一段和双阳组三段,奢岭组一段烃源岩也达到了生烃门限,烃源岩以腐殖型为主,双阳组一段底砾岩,双阳组二段厚层砂岩和奢岭组一段砂岩为储层,油气主要在沟通源岩与储层的断裂系统中进行运移,奢岭组位于厚层泥岩内由于靠近源岩,岩性的侧向变化形成封挡,形成自生自储的岩性油气藏;双阳组近岸水下扇体发育,规模大,受埋深影响储层条件偏差,主要为断层-岩性油气藏。在伊通盆地西北缘鹿乡-岔路河断陷油气成藏地质条件综合分析基础之上,系统总结鹿乡-岔路河断陷油气分布规律,认为鹿乡-岔路河断陷具有含油层系多、油层埋藏深的特点,总体呈现油气纵向叠加连片分布的格局。初步评价伊通盆地西北缘鹿乡-岔路河断陷具有5000万吨油气勘探潜力,是伊通盆地下步油气勘探与开发的重点区带。
[Abstract]:The Yitong basin runs through the middle of Jilin province along the north-east direction and lies between Changchun and Jilin. It is a long and narrow fault basin in Jilin province. The geological conditions are complicated, the source rock is thick, the quality is good, the reservoir is developed, and the compression of the basin in the late stage of evolution makes the Yitong Basin a oil-gas rich basin with great exploration potential. Because the seismic data of Luxiang-Chailuhe fault depression in the northwest margin of Yitong Basin were collected in the late 1990s, the quality of the data is poor. With the improvement of exploration degree, the data quality of the old exploration area is not enough to meet the requirements of modern exploration. It is very important to reinterpret the data of the old exploration area by new technical means for the exploration of Yitong basin. The Luxiang-Chailuhe fault depression in the northwest margin of Yitong basin has complicated structure, large dip angle, low signal-to-noise ratio of seismic data, poor imaging quality, and it is difficult to depict fan body. In view of the above problems, through the application of VSP non-zero bias seismic technique, paleogeomorphology analysis technology and so on, by combining seismic data with logging data to identify the structural style and carry out fan body characterization, the favorable reservoir is predicted. Furthermore, the reservoir forming conditions of Luxiang-Chaluhe fault depression in northwest margin of Yitong Basin are studied. The results show that the northwestern margin of Wanchang area in Chailuhe fault depression is affected by strike-slip compressive tectonic stress and has a good reservoir forming background. There are three sets of hydrocarbon source rocks developed in this area, namely Shuangyang formation, Huiling formation and Yongji formation, which are in the mature-high mature stage. Fan delta sand bodies of Wanchang formation are generally developed in this area, with shallow burial depth and good reservoir conditions. Mudstone of Qijia formation is a good regional caprock, and mudstone of the second member of Wanchang formation and the third member of Wanchang formation are good direct caprocks. Multiple faults communicate the source rock of the lower part, which can form the lithology-structure reservoir of the lower generation and upper reservoir, and the reservoir shows the characteristics of distant source and two-stage reservoir formation. In Chang40-Chang48 well area of northwestern margin of Chailuhe fault depression, the first member of Shuangyang formation is the main source rock. The source rock is buried deep and the maturity of the source rock reaches mature-over-mature stage. The second member of Shuangyang formation has developed large nearshore underwater fan, and the sandstone reservoir has good physical properties. It is a good reservoir, and a large set of gray and black mudstone formed in the third member of Shuangyang formation is a good regional caprock. The oil and gas generated in the extensional stage migrate through the fault to the subsea fan of the second stage of Shuangyang formation, forming a fault-lithologic reservoir. The reservoir shows the characteristics of near source and multi-stage reservoir formation. The limit of controlled reservoir thrust fault in Luxiang fault depression is long and narrow extension. The source rocks are mainly the first member of Shuangyang formation and the third member of Shuangyang formation. The source rocks of the first member of the Yaoling formation also reach the threshold of hydrocarbon generation. The source rocks are mainly humic type and the first member of Shuangyang formation is the bottom conglomerate. The thick sandstone of the second member of Shuangyang formation and the sandstone of the first member of the Qiling formation are reservoirs. Oil and gas are mainly migrated in the fault system between source rock and reservoir. The lateral variation of lithology in the thick mudstone is blocked by the lateral variation of lithology. Forming self-generated and self-stored lithologic reservoirs; The offshore subaqueous fan body of Shuangyang formation has a large scale and is affected by the depth of burying, which is mainly fault-lithologic reservoir. On the basis of comprehensive analysis of oil and gas accumulation geological conditions in Luxiang-Chailuhe fault depression on the northwest margin of Yitong Basin, the distribution of oil and gas in Luxiang-Chailuhe fault depression is systematically summarized. It is considered that Luxiang-Chailuhe fault depression has more oil-bearing strata. Because of the depth of oil reservoir, the oil and gas distribution pattern of vertical superposition and continuous slice is presented in general. The preliminary evaluation of Luxiang-Chailuhe fault depression in the northwest margin of Yitong Basin has a potential of 50 million tons of oil and gas exploration, which is the key zone for oil and gas exploration and development in Yitong Basin.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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