白豹281区长6_3油层组储层评价
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摘要
本文研究区白豹281区位于鄂尔多斯盆地陕北斜坡带的西部,总体上表现为西倾单斜构造,在西倾单斜的基础上,发展一系列由差异压实引起的鼻状构造。目的层上三叠统延长组第6段是鄂尔多斯盆地中生界最生要的含油层段之一,其油气藏类型以岩性—地层油气藏为主。结合长63油层组区域地质特征研究成果,以沉积旋回为基础,区域性标志层为控制,建立覆盖全区的连井剖面,以岩性曲线为主要对比划分依据,完成地层精细划分与对比。充分利用岩心观察结果、岩石薄片鉴定成果及粒度分析等资料,结合测井相特征分析,研究沉积相平面展布。在此基础上,以沉积储层地质学理论为指导,综合利用岩心资料、薄片资料及压汞分析资料,研究储层物性特征及孔隙结构特征。利用孔渗资料及以上研究成果,对长63油层组以小层为单元进行层间、层内、平面非均质性研究。最后综合以上分析成果,建立储层分类评价标准,对储层进行综合评价,结合油气成藏规律,预测研究区有利及较有利储集相带。
本文以单井资料分析为基础,在整理、消化、总结前人研究成果的基础上,依据研究区现有的钻井、取芯、测井、试油等资料对储层特征进行研究。在研究方法上,采用常规油气藏描述技术和方法;在成图技术方面,主要采用了Carbon、Geomap和Discover成图分析软件综合对储层进行研究。
经研究分析发现:长63油层组自下而上可进一步细分为三个小层:长633、长632、长631小层。长63油层组属于三角州前缘湖底滑塌浊积扇沉积,沉积亚相主要为中扇和外扇亚相,微相类型主要为辫状水道。研究区砂体较为发育,横向上,长632和长633小层的砂体连通性较好;纵向上,发育多套砂体,相互叠置,反映多期次的滑塌叠置;平面上,砂体整体呈NE—SW向展布,砂体厚度及展布形态受沉积相控制。储层物性总体较差,孔隙度平均值为10.72%,渗透率平均值为0.288×10-3um2,含油饱合度平均值为42%,属低孔-特低孔、超低渗储层。储层非均质性严重,非均质强弱顺序为:长631、长632、长633。在沉积微相、储层物性和砂体平面展布的基础上,根据存储系数,建立储层分类评价标准,将工区储集层划分为四类,Ⅰ、Ⅱ类储层具有较好的储集渗流能力,III类储层较差,IV类为非储层。在对沉积相、储层物性和砂体平面展布特征研究的基础上,对长63进行了综合评价。
研究区以Ⅰ类储层为主,该类储层整体呈北东—西南走向,主要分布在白240—白453—白254井所围区域,面积大,连片性好,储层的物性好,含油饱合度高,储集能力和渗流能力强,单井日产量高,是稳产和高产的集中区域。储层较有利区为Ⅱ类储层,位于工区西部白473—白460井区,呈条带状分布,面积较小。
The study area of this paper is the Baibao 281 area, which is located in the west of Shanbei Slope Belt in Ordos Basin. In totally, the Baobao 281 area shows the pitch structure westward. And on the basis of the structure, the Baobao 281 develops a series of nose like structure, which were caused by the differential compaction. The target layer is Yanchang Formation sixth phase in Upper Triassic, that is one of the most important oil bearing layers in Ordos Basin, whose oil-pool type is lithology-strata oil pool. On the basis of the cycle of sedimentation, the author combines the regional geology and regionality marker bed, and then builds up section profile in the study area. At the same time, according the well line and well logging, the author detailedly divides and compares the strata. And the author utilizes the result of the core observation, thin section identification and the data of grading analysis, combines the electrofacies analysis. On the top of that, the author studies the law of the sedimentary facies in plane. Afterward, directeing by the theory of the sedimentation and reservoir geology, the author overall utilizes the core and the thin and mercury pemetration, studies the reservoir physical property and the characteristic of pore configuration. And then using poroperm characteristics and the top of it, the author studies the aeolotroprism of interlamination, intraformational and flat. Finally, combining the law of hydrocarbon accumulation, the author establishes the classification evaluation criterion and forecasts the favor and the less favor accumulation facies belt .
On the basis of the data of single well, the author straightens out, digests and sums up the report of investigation, studies the reservoir characteristic with availability well drilling, coring, well logging and testing, etc. In the research method, the author adopts the convention pool description technique. In mapping technology, the author adopts the mapping analysis software such as Carbon, Geomap and Discovery, synthetically studies the reservoir.
The study found that the Oil layer in Chang 63 is divided into three small layers from bottom to top: Chang 633, Chang632, Chang631 small layer. Chang 63 oil layer is the lake slump turbidite fan deposits in delta front, whose sedimentary subfacies is majpr middle fan and outer fan, the sedimentary microfacies is major braided channel. The sand body in the study area is more development. In horizontal, the connectivity of the Chang 632 and Chang 633 small layer sand body is better. In vertical, the study area develops several sand bodies, which is overlapped and reflects the slump overlay in many times. In plane, the whole sand body distribute from NE to SW. And the sand thickness and distribution patterns are controlled by sedimentary facies. But the reservoir physical property is totally poor. The average value of the porosity is 10.72%, the average value of the permeability is 0.288×10-3um2, and the average value of the oil saturation is 42%. So the author believes that the reservoir physical property is low porosity, extremely low porosity and super low permeability. The aeolotropism of reservoir is serious. The srength order of the aeolotropism is Chang631, Chang632, Chang633. On the basis of sedimentary microfacies, reservoir physical property and the plan distribution of the sand body, the author establishes the criterion of the reservoir classification. And then the reservoir in the study area is divided into four types: typeⅠand typeⅡhave more better infiltrating fluid capability of the reservoir, type III is less better, type IV is non-reservoir. And then the author overall evaluates the Chang 63.
The typeⅠis most important in the study area, which distributes along northeast to southwest. The typeⅠdistributes around the Bai240-Bai453-Bai254 area. The space is large and the contiguous nature is good. And the reservoir physical property is good and oil saturation is high. The storage capability and infiltrating fluid capability are strong. The daily output of the single well is high. So the author believes that the area is concentrated area which is Stable and high yield. The less favor reservoir is typeⅡ,which is located the Bai473-Bai460 in the west of the study area that distributes band and the space is small.
本文以单井资料分析为基础,在整理、消化、总结前人研究成果的基础上,依据研究区现有的钻井、取芯、测井、试油等资料对储层特征进行研究。在研究方法上,采用常规油气藏描述技术和方法;在成图技术方面,主要采用了Carbon、Geomap和Discover成图分析软件综合对储层进行研究。
经研究分析发现:长63油层组自下而上可进一步细分为三个小层:长633、长632、长631小层。长63油层组属于三角州前缘湖底滑塌浊积扇沉积,沉积亚相主要为中扇和外扇亚相,微相类型主要为辫状水道。研究区砂体较为发育,横向上,长632和长633小层的砂体连通性较好;纵向上,发育多套砂体,相互叠置,反映多期次的滑塌叠置;平面上,砂体整体呈NE—SW向展布,砂体厚度及展布形态受沉积相控制。储层物性总体较差,孔隙度平均值为10.72%,渗透率平均值为0.288×10-3um2,含油饱合度平均值为42%,属低孔-特低孔、超低渗储层。储层非均质性严重,非均质强弱顺序为:长631、长632、长633。在沉积微相、储层物性和砂体平面展布的基础上,根据存储系数,建立储层分类评价标准,将工区储集层划分为四类,Ⅰ、Ⅱ类储层具有较好的储集渗流能力,III类储层较差,IV类为非储层。在对沉积相、储层物性和砂体平面展布特征研究的基础上,对长63进行了综合评价。
研究区以Ⅰ类储层为主,该类储层整体呈北东—西南走向,主要分布在白240—白453—白254井所围区域,面积大,连片性好,储层的物性好,含油饱合度高,储集能力和渗流能力强,单井日产量高,是稳产和高产的集中区域。储层较有利区为Ⅱ类储层,位于工区西部白473—白460井区,呈条带状分布,面积较小。
The study area of this paper is the Baibao 281 area, which is located in the west of Shanbei Slope Belt in Ordos Basin. In totally, the Baobao 281 area shows the pitch structure westward. And on the basis of the structure, the Baobao 281 develops a series of nose like structure, which were caused by the differential compaction. The target layer is Yanchang Formation sixth phase in Upper Triassic, that is one of the most important oil bearing layers in Ordos Basin, whose oil-pool type is lithology-strata oil pool. On the basis of the cycle of sedimentation, the author combines the regional geology and regionality marker bed, and then builds up section profile in the study area. At the same time, according the well line and well logging, the author detailedly divides and compares the strata. And the author utilizes the result of the core observation, thin section identification and the data of grading analysis, combines the electrofacies analysis. On the top of that, the author studies the law of the sedimentary facies in plane. Afterward, directeing by the theory of the sedimentation and reservoir geology, the author overall utilizes the core and the thin and mercury pemetration, studies the reservoir physical property and the characteristic of pore configuration. And then using poroperm characteristics and the top of it, the author studies the aeolotroprism of interlamination, intraformational and flat. Finally, combining the law of hydrocarbon accumulation, the author establishes the classification evaluation criterion and forecasts the favor and the less favor accumulation facies belt .
On the basis of the data of single well, the author straightens out, digests and sums up the report of investigation, studies the reservoir characteristic with availability well drilling, coring, well logging and testing, etc. In the research method, the author adopts the convention pool description technique. In mapping technology, the author adopts the mapping analysis software such as Carbon, Geomap and Discovery, synthetically studies the reservoir.
The study found that the Oil layer in Chang 63 is divided into three small layers from bottom to top: Chang 633, Chang632, Chang631 small layer. Chang 63 oil layer is the lake slump turbidite fan deposits in delta front, whose sedimentary subfacies is majpr middle fan and outer fan, the sedimentary microfacies is major braided channel. The sand body in the study area is more development. In horizontal, the connectivity of the Chang 632 and Chang 633 small layer sand body is better. In vertical, the study area develops several sand bodies, which is overlapped and reflects the slump overlay in many times. In plane, the whole sand body distribute from NE to SW. And the sand thickness and distribution patterns are controlled by sedimentary facies. But the reservoir physical property is totally poor. The average value of the porosity is 10.72%, the average value of the permeability is 0.288×10-3um2, and the average value of the oil saturation is 42%. So the author believes that the reservoir physical property is low porosity, extremely low porosity and super low permeability. The aeolotropism of reservoir is serious. The srength order of the aeolotropism is Chang631, Chang632, Chang633. On the basis of sedimentary microfacies, reservoir physical property and the plan distribution of the sand body, the author establishes the criterion of the reservoir classification. And then the reservoir in the study area is divided into four types: typeⅠand typeⅡhave more better infiltrating fluid capability of the reservoir, type III is less better, type IV is non-reservoir. And then the author overall evaluates the Chang 63.
The typeⅠis most important in the study area, which distributes along northeast to southwest. The typeⅠdistributes around the Bai240-Bai453-Bai254 area. The space is large and the contiguous nature is good. And the reservoir physical property is good and oil saturation is high. The storage capability and infiltrating fluid capability are strong. The daily output of the single well is high. So the author believes that the area is concentrated area which is Stable and high yield. The less favor reservoir is typeⅡ,which is located the Bai473-Bai460 in the west of the study area that distributes band and the space is small.
引文
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