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Method for recognizing oil layer by using petroleum inclusion and pitch and migration tracing

A technology of petroleum inclusions and inclusions, applied in the field of oil and gas exploration

Active Publication Date: 2007-09-19
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Method for recognizing oil layer by using petroleum inclusion and pitch and migration tracing
  • Method for recognizing oil layer by using petroleum inclusion and pitch and migration tracing
  • Method for recognizing oil layer by using petroleum inclusion and pitch and migration tracing

Examples

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Effect test

Embodiment 1

[0030] Example 1: oil reservoir identification

[0031] In the early Yanchang period of the Late Triassic, due to the relative uplift of the periphery of the basin, the large Ordos Lake Basin with large area and wide water area was formed. The Upper Triassic-Cretaceous strata in the Ordos Basin are multi-cycle fluvial-lacustrine clastic rock deposits, with a cumulative thickness of 3000-4000m, and the thickness of the strata preserved in the southeastern part of the basin is the largest. The Yanchang Formation and the Yan'an Formation are two main oil-gas-bearing formations. Among them, the Yanchang Formation is the main exploration target layer. The Chang 8 member has well-developed sand bodies, wide distribution, high degree of diagenesis, low porosity, low permeability - ultra-low permeability type, generally poor physical properties and obvious heterogeneity, conventional logging and mud logging interpretation It is more difficult.

[0032] Figure 1 shows that the spati...

Embodiment 2

[0033] Example 2: Oil migration tracking

[0034] Through oil migration tracking, it is possible to reveal where oil migrates from hydrocarbon-generating kitchens and where it gathers, which are key issues in oil exploration work, so it is a very important link. However, so far, it is still very weak. The structure of the Ordos Basin is gentle and the sand bodies are widely distributed, so it is difficult to grasp the distribution of oil. The discovery of Xifeng Oilfield provides good conditions for tracking oil migration (Fig. 3). The Chang 81 sand body where the oilfield is located is used to pass through the north and south, but the current occurrence is gentle. It is known that the source rocks overlying Chang 73 are directly filled with crude oil downwards to form reservoirs. Since the overlying source rocks in Xifeng Oilfield are very thin, if the accumulation mechanism of this oilfield is really like this, then the distribution of source rocks should be the main line...

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Abstract

The invention relates to oil-gas prospecting technical field, especially using the petroleum inclusion and asphalt to distinguish the oil reservoir and fulfill the migration tracing. With the statistical data from the petroleum inclusion and asphalt, the invention may distinguish the oil reservoir during the drilling (including the prospecting and development) or later; and determine the petroleum migration direction, and trace its routing, search the prevailing migration channel etc. under multi-stage migration and accumulation, fulfill the multi-stage and multiple genesis statistics for petroleum inclusion, trace the oil-gas migration during different geologic phase, determine the oil-gas migration direction and prevailing channels during different stages, and the variation of physical and chemical conditions during migration, thereby recovers the history of oil-gas migration and accumulation, provides the important basis for finding the oil-gas distribution law and advantageous areas for oil-gas migration and accumulation.

Description

Technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for using oil inclusions and asphalt to identify oil layers and carry out migration tracking. The present invention uses statistical data of petroleum inclusions and asphalt to identify oil layers during or after drilling (including exploratory wells and development wells); it can also identify the direction of oil migration, track its path, and search for advantageous operations. channel etc. In the case of multi-stage migration and accumulation, the oil and gas migration in different geological periods can be tracked, the direction and dominant channel of oil and gas migration in different periods can be identified, and the The changes in physical and chemical conditions during the migration process can be used to restore the history of oil and gas migration and accumulation, and provide an important basis for grasping the distribution of oil and gas and...

Claims

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Application Information

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IPC IPC(8): G01V1/40G01N35/00G01N21/17
Inventor 张刘平
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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