Main-Controlling Factor Analysis of Hydrocarbon Accumulation in the Bedrock Buried Hill of Lishu Fault Depression and Its Exploration Prospect

doi:10.3969/j.issn.1006-6535.2020.04.004

Abstract

Abstract: The Lishu fault depression in the southern Songliao Basin is characterized by complex bedrock structure and diverse buried hill development mechanisms. The major challenges for further evaluation of buried hill hydrocarbon exploration potential include buried hill distribution prediction, reservoir performance evaluation and hydrocarbon accumulation patterns. Geological and geophysical techniques were adopted to analyze the main controlling factors of buried-hill hydrocarbon accumulation based on the drilling core test. Result indicates that the buried hill development is dependent on basin-controlling fault, fold structure and reverse structure. Bedrock reservoir is generally featured by low porosity and low permeability, and structural fractures are the key aspect to improving reservoir performance. Generally, there is a increasing trend for the fracture development closer to the fault zone. Hydrocarbon enrichment and accumulation in the buried hill depends on the contact patterns of bedrock and source rock, consistency between fracture direction, opening level and hydrocarbon migration mode. There is a direct contact between bedrock buried hill and source rock in Sangbei and Sangnan, and favorable hydrocarbon supply condition is conductive to bedrock hydrocarbon accumulation. The bedrock buried hill shows a relatively low amplitude in the central tectonic belt, Qikeshu, Qinjiatun and other regions which are far away from the major fault. The basement contacts with source rock as fault and unconformity, which is favorable to bedrock hydrocarbon accumulation. A total of more than 20 buried hill traps were identified in the Lishu fault depression, indicating great hydrocarbon exploration prospect. The western Sangshutai buried hill zone and the central structural buried hill zone are considered as the major zones for further hydrocarbon accumulation. This research could provide certain theoretical reference for the bedrock hydrocarbon resource prediction and exploration.

Key words: bedrock buried hill, hydrocarbon accumulation condition, main-controlling factor of hydrocarbon accumulation, favorable zone, buried hill hydrocarbon exploration in Lishu fault depression

CLC Number:

TE122.1

Cheng Jian, Zhou Zhuoming, Duan Tiejun, Yang Hao, Song Zhenxiang. Main-Controlling Factor Analysis of Hydrocarbon Accumulation in the Bedrock Buried Hill of Lishu Fault Depression and Its Exploration Prospect[J]. Special Oil & Gas Reservoirs, 2020, 27(4): 26-32.

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