准噶尔盆地东道海子凹陷上乌尔禾组油气勘探思路及发现

doi:10.7657/XJPG20220201

摘要/Abstract

摘要：

东道海子凹陷为准噶尔盆地重要的生烃凹陷之一,在其周缘凸起侏罗系、白垩系及凹陷内二叠系上乌尔禾组获得油气发现。以凹陷内上乌尔禾组油气重点突破井为主线,结合勘探思路和理论认识的变化,将研究区上乌尔禾组油气勘探划分为源边断块勘探阶段、下凹断块勘探阶段和源上岩性勘探阶段。勘探思路的转变不仅带来了凹陷东斜坡上乌尔禾组高产油气藏的发现,同时取得几点认识：平地泉组烃源岩进入生轻质油气阶段,为上乌尔禾组近源成藏提供油气;上乌尔禾组发育大型退覆式扇三角洲沉积体系,低位体系域厚层及水进体系域薄层叠置的扇三角洲前缘相为有利储集层,分布面积达3 350 km²;上乌尔禾组具有“沟槽富砂、相带控储、孔缝控产”的油气成藏特征。油气发现集中在凹陷东部,凹陷西部尚未钻揭,以上述勘探思路及地质认识指导勘探部署,有望在东道海子凹陷获得新的油气发现。

关键词: 准噶尔盆地, 东道海子凹陷, 二叠系, 上乌尔禾组, 扇三角洲, 岩性, 油气勘探思路

Abstract:

Dongdaohaizi sag is one of the important hydrocarbon-generating sags in the Junggar basin. Petroleum discoveries have been made in the Jurassic and Cretaceous in the uplift around the sag and in the Permian upper Wuerhe formation within the sag. Focusing on key wells with oil and gas breakthroughs in the upper Wuerhe formation within the sag, and combining with the changes in exploration ideas and theoretical understanding, the exploration of the upper Wuerhe formation in the study area is divided into three stages, namely, source-edge fault block exploration stage, in-sag fault block exploration stage, and above-source lithologic exploration stage. The changes in exploration ideas brought about the discovery of high-yield oil and gas reservoirs in the upper Wuerhe formation on the eastern slope of the sag. Also, insights in three aspects have been gained. First, the source rocks in the Pingdiquan formation have entered the stage of light hydrocarbon generation, contributing to the near-source hydrocarbon accumulation in the upper Wuerhe formation. Second, a large-scale retrograde fan delta sedimentary system is developed in the upper Wuerhe formation, where the fan delta front facies belt superimposed by the thick layers of lowstand system tract(LST) and the thin layers of transgressive system tract(TST) serves as favorable reservoirs, with a distribution area of 3 350 km². Third, the hydrocarbon accumulation in the upper Wuerhe formation is characterized by sand enrichment in troughs, reserves controlled by facies belts, and production controlled by pores/fractures. Petroleum discoveries are concentrated in the eastern part, while no successful drilling result has been made in the western part of the sag. With these exploration ideas and geological understanding to guide the exploration deployment, there will be new discoveries of oil and gas in the Dongdaohaizi sag.

Key words: Junggar basin, Dongdaohaizi sag, Permian, upper Wuerhe formation, fan delta, lithology, petroleum exploration idea

中图分类号:

TE132.11

李艳平, 邹红亮, 李雷, 付基友, 夏雨, 谢俊阳. 准噶尔盆地东道海子凹陷上乌尔禾组油气勘探思路及发现[J]. 新疆石油地质, 2022, 43(2): 127-134.

LI Yanping, ZOU Hongliang, LI Lei, FU Jiyou, XIA Yu, XIE Junyang. Petroleum Exploration Ideas and Discoveries in Upper Wuerhe Formation, Dongdaohaizi Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(2): 127-134.

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