|本期目录/Table of Contents|

[1]陈 波,段冬平,刘英辉,等.西湖凹陷中深层河流相砂体地震沉积学解释与沉积演化分析*[J].中国海上油气,2019,31(03):117-126.[doi:10.11935/j.issn.1673-1506.2019.03.014]
 CHEN Bo,DUAN Dongping,LIU Yinghui,et al.Seismic sedimentary interpretation and sedimentary evolution analysis on middle-deep fluvial facies sandbodies in Xihu sag,East China Sea basin[J].China Offshore Oil and Gas,2019,31(03):117-126.[doi:10.11935/j.issn.1673-1506.2019.03.014]
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西湖凹陷中深层河流相砂体地震沉积学解释与沉积演化分析*()

《中国海上油气》[ISSN:1673-1506/CN:11-5339/TE]

卷:
第31卷
期数:
2019年03期
页码:
117-126
栏目:
东海盆地油气勘探开发成果专辑
出版日期:
2019-06-25

文章信息/Info

Title:
Seismic sedimentary interpretation and sedimentary evolution analysis on middle-deep fluvial facies sandbodies in Xihu sag,East China Sea basin
文章编号:
1673-1506(2019)03-0117-10
作者:
陈 波段冬平刘英辉丁 芳陈 晨
中海石油(中国)有限公司上海分公司 上海 200335
Author(s):
CHEN BoDUAN DongpingLIU YinghuiDING FangCHEN Chen
CNOOC China Limited, Shanghai Branch, Shanghai 200335, China
关键词:
西湖凹陷 中深层 河流相 地震沉积学 沉积演化
Keywords:
Xihu sag middle-deep layers fluvial facies seismic sedimentology sedimentary evolution
分类号:
TE243
DOI:
10.11935/j.issn.1673-1506.2019.03.014
文献标志码:
A
摘要:
西湖凹陷中央反转构造带渐新统花港组储层为河流相沉积,以厚层、块状砂岩为特点,部分发育薄砂体,是良好的油气储层,但受制于海上井资料匮乏、储层埋深较大、砂体非均质性强等因素,砂体预测难度大、可靠性较低。基于高分辨率层序地层学,利用地震沉积学方法中90°相位转换、等时地层切片等技术,综合测井相、地震相,对西湖凹陷中央反转带中南部黄岩区花港组沉积体系及砂体进行了识别与描述。研究认为:花港组可划分为上段、下段2个三级层序,在花上段5个四级层序中可识别出3种河道类型,其中曲流河宽0.2~1.2 km,单砂体厚8~30 m,宽厚比25:1~40:1; 辨状河道宽0.8~2.0 km,单砂体厚20~40 m,宽厚比40:1~50:1; 分流河道宽0.5~3.5 km,单砂体厚15~30 m,宽厚比30:1~100:1; 自下而上由H5层三角洲平原分流河道逐渐向H4层三角洲前缘、H3层辫状河、H2—H1曲流河沉积体系演化; 辫状河心滩、三角洲平原分流河道等复合砂体均钻遇较好油气显示,可作为优质的储层,是气田内部寻找剩余油气及周边挖潜的主要方向。
Abstract:
The Oligocene Huagang Formation reservoir in the central reversal tectonic belt of the Xihu sag belongs to the fluvial facies deposit, and is characterized by massive bulky sandstones with partially developed thin sandbodies, which is classified as the good oil and gas reservoir. However, due to the insufficient offshore well data, the large burial depth of the reservoir, and the strong heterogeneity of the sandbody, it is highly difficult to accurately make sandbody prediction. Under the guidance of high-resolution sequence stratigraphy theory, the techniques of 90° phase transformation and isochronous stratigraphic slice in seismic sedimentology, together with logging and seismic facies are used to identify and describe the sedimentary systems and sandbodies of Huagang Formation in the central southern part of the central reversal zone of the Xihu sag. According to the research, the Huagang Formation can be divided into two third-order sequences(SQ1\SQ2), and the SQ2 can be divided into five fourth-order sequences. Three types of channels have been identified in the five fourth-order sequences of SQ2. Amongthem, the meandering river facies has the width of 0.2~1.2 km, the single sandbody thickness of 8~30 m, and the width to thickness ratio of 25:1~40:1; the braided channel facies has the width of 0.8~2.0 km, single sandbody thickness of 20~40 m, and the width to thickness ratio of 40:1~50:1; the distributary channel facies has the width of 0.5~3.5 km, the single sandbody of 15~30 m thick, and the width to thickness ratio of 30:1~100:1. From bottom to top, the delta plain distributary channel facies in H5 layer gradually evolved into the sedimentary systems of delta front in H4 layer, braided channel in H3 layer, and meandering river in H2—H1 layers. Good oil and gas shows were encountered in the composite sandbodies such as the braided river channel bar and the delta plain distributary channel, which can serve as the high-quality reservoirs. It is the main targets of remaining oil seeking and peripheral potential tapping within the gas field.

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备注/Memo

备注/Memo:
*“十三五”国家科技重大专项“东海厚层非均质性大型气田有效开发关键技术(编号:2016ZX05027-004)”部分研究成果。
第一作者简介: 陈波,男,硕士,工程师,主要从事开发地质综合研究工作。地址:上海市长宁区通协路388号中海油大厦A座630室(邮编:200335)。E-mail:chenbo8@cnooc.com.cn。
更新日期/Last Update: 2019-05-20