胡尖山地区前侏罗纪古地貌及成藏条件分析
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摘要
运用印模法对鄂尔多斯盆地胡尖山地区前侏罗纪古地貌进行了恢复,并从储盖条件、油源分布、成藏模式、小幅度构造等方面对古地貌油藏的形成条件进行了详细分析。结果表明:受晚三叠世印支运动末幕的影响,研究区延长组顶部遭受剥蚀,形成了沟壑纵横、丘陵起伏、水系广布的地貌形态,可划分为6种地貌单元。古地貌形态对上覆富县组—延安组地层的相带展布、压实披覆构造的形成起到关键作用。古地貌形成的剥蚀面沟通了延长组与延安组的生储盖组合;长7生烃凹陷一定程度上控制了古地貌油藏的宏观分布,距离生烃凹陷越近,延安组油藏分布越密集,产量越高;河间丘、坡嘴、斜坡等地貌单元易形成披覆圈闭、岩性-构造圈闭,构成相应的成藏模式而聚集油气;油藏范围内,鼻隆、局部隆起等小幅度构造控制着油气的聚集程度和高低产井的分布。
The pre-Jurassic palaeogeomorphology in Hujianshan area of Ordos Basin was restored using the impression method, and the conditions for the formation of palaeogeomorphic reservoirs were analyzed in detail from the aspects of reservoir and seal conditions, oil source distribution, hydrocarbon accumulation model and small scale structures. The results show that affected by the end of the Indosinian Movement at Late Triassic, the top of the Yanchang Formation in the study area was denuded, forming a landform configuration with gully aspect, hilly terrain, and extensive water-spreading, and the landform configuration is divided into six geomorphic units. The palaeogeomorphic form plays a key role in the formation of the facies belt distribution and compacted overlying tectonic of the upper Fuxian and Yan′an formations. The denudation surface formed by the palaeogeomorphology links up the reservoir and the covering strata combination between Yanchang and Yan′an Formations. The Chang 7 hydrocarbon generation depression controls the macro-distribution of the palaeogeomorphic reservoir to a certain extent. The closer the hydrocarbon depression, the denser the reservoir distribution of the Yan′an Formation, the higher the production; the geomorphic units such as the river hillock, the mouth of slope, the slope, etc. are easy to form overlying traps and lithologic-structural traps, and constitute the slope mouth accumulation model, river hillock accumulation model and slope accumulation model, which are the main places of oil and gas accumulation. Within the reservoir range, small scale structures, such as nose-shaped uplift and local uplift, control the degree of hydrocarbon accumulation and the distribution of high and low production wells.
The pre-Jurassic palaeogeomorphology in Hujianshan area of Ordos Basin was restored using the impression method, and the conditions for the formation of palaeogeomorphic reservoirs were analyzed in detail from the aspects of reservoir and seal conditions, oil source distribution, hydrocarbon accumulation model and small scale structures. The results show that affected by the end of the Indosinian Movement at Late Triassic, the top of the Yanchang Formation in the study area was denuded, forming a landform configuration with gully aspect, hilly terrain, and extensive water-spreading, and the landform configuration is divided into six geomorphic units. The palaeogeomorphic form plays a key role in the formation of the facies belt distribution and compacted overlying tectonic of the upper Fuxian and Yan′an formations. The denudation surface formed by the palaeogeomorphology links up the reservoir and the covering strata combination between Yanchang and Yan′an Formations. The Chang 7 hydrocarbon generation depression controls the macro-distribution of the palaeogeomorphic reservoir to a certain extent. The closer the hydrocarbon depression, the denser the reservoir distribution of the Yan′an Formation, the higher the production; the geomorphic units such as the river hillock, the mouth of slope, the slope, etc. are easy to form overlying traps and lithologic-structural traps, and constitute the slope mouth accumulation model, river hillock accumulation model and slope accumulation model, which are the main places of oil and gas accumulation. Within the reservoir range, small scale structures, such as nose-shaped uplift and local uplift, control the degree of hydrocarbon accumulation and the distribution of high and low production wells.
引文
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[28]张庆玉,梁彬,曹建文,等.哈拉哈塘一间房组古地貌及岩溶发育条件研究[J].断块油气田,2014,21(4):413-415.
[29]于雷,王维斌,车飞,等.鄂尔多斯盆地吴旗油区下侏罗统古地貌特征与油气富集关系[J].断块油气田,2014,21(2):147-151.
[30]胡纯心,杨帅,陆永潮,等.长岭凹陷多环坡折地貌发育特征及对沉积过程的控制[J].石油实验地质,2013,35(1):17-23.
[31]郭凯.鄂尔多斯盆地陇东地区长7段有效烃源岩及生排烃研究[J].石油实验地质, 2017, 39(1):15-23.
[32]王付斌,尹伟,陈纯芳.鄂尔多斯盆地红河油田长8油层组致密砂岩储层“甜点”成因机制[J].石油实验地质,2017,39(4):484-490.
[2]李慧琼,蒲仁海,屈红军,等.鄂尔多斯盆地三叠系与侏罗系不整合面测井识别方法讨论[J].西北大学学报(自然科学版),2017,47(4):577-584.
[3]苗建宇,赵建设,李文厚,等.鄂尔多斯盆地南部烃源岩沉积环境研究[J].西北大学学报(自然科学版),2005,35(6):771-776.
[4]周新平,惠潇,邓秀芹,等.鄂尔多斯盆地陕北地区延长组长8暗色泥岩特征及其成藏意义[J].西北大学学报(自然科学版),2017,47(6):866-876.
[5]庞军刚,李文厚,石硕,等.陕北地区长7沉积相特征及石油地质意义[J].西北大学学报(自然科学版),2010,40(3):488-492.
[6]程艳红.JW地区侏罗系成藏规律及控制因素研究[D].秦皇岛:燕山大学,2016.
[7]宋凯,吕剑文,凌升阶,等.鄂尔多斯盆地定边-吴旗地区前侏罗纪古地貌与油藏[J].古地理学报,2003,5(4):497-507.
[8]郭正权,张立荣,楚美娟,等.鄂尔多斯盆地南部前侏罗纪古地貌对延安组下部油藏的控制作用[J].古地理学报,2008,10(1):63-71.
[9]丁晓琪,张哨楠,刘岩.鄂尔多斯盆地南部镇泾油田前侏罗纪古地貌与油层分布规律[J].地球科学与环境学报,2008,30(4):385-388,395.
[10]毛飞跃,侯长冰,苟幸福,等.鄂尔多斯盆地镇原油田侏罗系古地貌与油成藏关系分析[J].岩性油气藏,2013,25(5):44-48.
[11]郭正权,潘令红,刘显阳,等.鄂尔多斯盆地侏罗系古地貌油田形成条件与分布规律[J].中国石油勘探,2001,6(4):20-27.
[12]曹志松,申赵军.古地貌恢复方法及其优缺点[J].环球人文地理2011,8(下):8-9,31.
[13]赵俊兴,陈洪德,时志强.古地貌恢复技术方法及其研究意义:以鄂尔多斯盆地侏罗纪沉积前古地貌研究为例[J].成都理工学院学报,2001,28(3):260-266.
[14]侯伟.姬塬油田铁边城区块侏罗系油藏成藏规律研究[D].西安:西安石油大学,2014.
[15]张晓华.姬塬油田延安组高分辨率层序地层学与沉积微相研究[D].北京:北京海洋大学,2008.
[16]朱静,李文厚,韩永,等.陇东地区前侏罗纪古地貌及油藏成藏规律研究[J].沉积学报,2010,28(4):1229-1237.
[17]陶莹.麻黄山西区块东北部延安组储层特征及评价[D].成都:成都理工大学,2009.
[18]蔡佳.琼东南盆地古近系古地貌恢复及其对层序样式和沉积特征的控制[D].北京:中国地质大学(北京),2009.
[19]田姗姗.琼东南盆地裂后期构造沉降分析及古地貌恢复[D].北京:中国地质大学(北京),2010.
[20]史德锋.陕北绥靖地延安油房叛油气成藏条件与成藏模式[D].长沙:中南大学,2012.
[21]王建民,田东恩,任战利,等.陕北志丹地区前侏罗纪古地貌及其控制作用[J].兰州大学学报(自然科学版),2012,48(4):1-7.
[22]杨俊杰,张伯荣,曾正全.陕甘宁盆地侏罗系古地貌油田的油藏序列及勘探方法[J].大庆石油地质与开发,1984,3(1):74-84.
[23]汪海燕,李仲东,丁晓琪,等.镇泾油田侏罗纪沉积前古地貌特征与延9段油藏分布[J].石油天然气学报(江汉石油学院学报),2008,30(1):170-173.
[24]王国壮,梁承春,聂小创,等.镇泾地区侏罗纪古地貌与延安组成藏关系[J].特种油气藏,2016,23(4):46-50,153.
[25]代廷勇.镇原地区前侏罗纪古地貌及其与油气富集关系[D].成都:成都理工大学,2016.
[26]曾传富,田景春,张涛,等.镇北地区前侏罗纪古地貌特征与油气富集规律研究[J].断块油气田,2015,22(3):273-277.
[27]王震.镇泾地区延长组剥蚀面古地貌特征与延安组成藏关系研究[D].成都:成都理工大学,2008.
[28]张庆玉,梁彬,曹建文,等.哈拉哈塘一间房组古地貌及岩溶发育条件研究[J].断块油气田,2014,21(4):413-415.
[29]于雷,王维斌,车飞,等.鄂尔多斯盆地吴旗油区下侏罗统古地貌特征与油气富集关系[J].断块油气田,2014,21(2):147-151.
[30]胡纯心,杨帅,陆永潮,等.长岭凹陷多环坡折地貌发育特征及对沉积过程的控制[J].石油实验地质,2013,35(1):17-23.
[31]郭凯.鄂尔多斯盆地陇东地区长7段有效烃源岩及生排烃研究[J].石油实验地质, 2017, 39(1):15-23.
[32]王付斌,尹伟,陈纯芳.鄂尔多斯盆地红河油田长8油层组致密砂岩储层“甜点”成因机制[J].石油实验地质,2017,39(4):484-490.