新疆塔里木盆地塔河油田奥陶系古洞穴型碳酸盐岩储层特征及其受控因素
|
摘要
塔河油田是近年来在新疆塔里木盆地发现的超亿吨级的碳酸盐岩大型油气田,古洞穴型碳酸盐岩储层是其非常重要的储层类型之一,但它的识别技术和发育规律仍是目前待攻关的难题。通过对古洞穴在钻井、录井、测井、试井及地震等方面的识别标志的研究,并与巴楚五道班古洞穴型碳酸盐岩储层野外露头剖面进行类比,详细描述了塔河油田奥陶系古洞穴的大小、结构及充填特征,探讨了洞穴发育程度与深度间的关系,同时研究了其储集性能及主要受控因素。在阿克库勒凸起围斜处呈裙边状分布的志留系—泥盆系及上奥陶统隔水层的分布控制了洞穴发育的范围与深度,洞穴发育的数量基本上是随深度递减。性能较好的储层有未充填洞穴储层和大型洞穴充填物孔隙型砂岩(溶积砂岩)。古洞穴型储层发育的主要受控因素有碳酸盐岩的岩组类型、岩石结构、构造线、断裂的走向、水文系统和岩溶地貌,其中以岩溶地貌最为突出。
The Tahe oilfield, discovered in the Tarim Basin of Xinjiang, has more than 01 billion tons of OOIP. Paleocave carbonate reservoir is one of very important reservoir types in the Tahe oilfield, but its identification technologies and development rules remain unsolved. Compared with the outcrop section of Wudaoban paleocave carbonate reservoir in the Bachu region, the size, structure and fill characters of Ordovician paleocave in the Tahe oilfield are described in detail on the basis of the paleocave identification symbols in drilling, logging, well logging, testing and seismic etc.. The development rules of paleocave depth are discussed. Simultaneously the reservoir properties and main controlling factors are studied. Development ranges and the depths of paleocave are controlled by the skirt edgeshape distribution of Silurian, Devonian and tight formation of the upper Ordovician in the peripheral slope of Akekule convex. With the decrease of formation depth, the paleocave'number decreases basically. The better paleocave carbonate reservoirs are unfilled paleocaves and the sandstone of paleocave fill matters. Carbonate rock type, rock texture, structure, fault, drainage system and karst topography are the controlling factors of paleocave reservoir properties, among which the karst topography is the most important one.
The Tahe oilfield, discovered in the Tarim Basin of Xinjiang, has more than 01 billion tons of OOIP. Paleocave carbonate reservoir is one of very important reservoir types in the Tahe oilfield, but its identification technologies and development rules remain unsolved. Compared with the outcrop section of Wudaoban paleocave carbonate reservoir in the Bachu region, the size, structure and fill characters of Ordovician paleocave in the Tahe oilfield are described in detail on the basis of the paleocave identification symbols in drilling, logging, well logging, testing and seismic etc.. The development rules of paleocave depth are discussed. Simultaneously the reservoir properties and main controlling factors are studied. Development ranges and the depths of paleocave are controlled by the skirt edgeshape distribution of Silurian, Devonian and tight formation of the upper Ordovician in the peripheral slope of Akekule convex. With the decrease of formation depth, the paleocave'number decreases basically. The better paleocave carbonate reservoirs are unfilled paleocaves and the sandstone of paleocave fill matters. Carbonate rock type, rock texture, structure, fault, drainage system and karst topography are the controlling factors of paleocave reservoir properties, among which the karst topography is the most important one.
引文
[1] 欧阳健.石油测井解释与储层描述[M].北京:石油工业出版社,1994.
[2] 何宇彬,邹成杰.关于喀斯特洞穴发育深度问题[J].中国岩溶,1997,16(2):167—175.
[3] LoucksRG.Paleocavecarbonatereservoirs:origins,burialdepthmodifications,spatialcomplexity,andreservoirimplication[J].AAPGBullletin,1999,83(11):1795—1834.
[4] 夏义平,柴桂林,汪昌贵,等.塔里木盆地轮南地区下奥陶统碳酸盐岩储层的控制因素分析[J].现代地质,2000,14(2):185—190.
[5] 拜文华,吕锡敏,李小军,等.古岩溶盆地岩溶作用模式及古地貌精细刻画[J].现代地质,2002,16(3):292—298.
[2] 何宇彬,邹成杰.关于喀斯特洞穴发育深度问题[J].中国岩溶,1997,16(2):167—175.
[3] LoucksRG.Paleocavecarbonatereservoirs:origins,burialdepthmodifications,spatialcomplexity,andreservoirimplication[J].AAPGBullletin,1999,83(11):1795—1834.
[4] 夏义平,柴桂林,汪昌贵,等.塔里木盆地轮南地区下奥陶统碳酸盐岩储层的控制因素分析[J].现代地质,2000,14(2):185—190.
[5] 拜文华,吕锡敏,李小军,等.古岩溶盆地岩溶作用模式及古地貌精细刻画[J].现代地质,2002,16(3):292—298.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心