辽河盆地东部凹陷渐新统辉绿岩:特征、识别与成藏规律

doi:10.11743/ogg20160309

Abstract

Abstract: Relationships between geology and logging/seismic responses were established for the study of diabase from Eastern Sag in Liaohe Basin based on 3 555 m logging intervals and core & cuttings of diabase from 41 wells and 560 km² 3D seismic data and observation of 86 thin sections acquired in the area.We investigated the lithology,lithofacies and logging identification features of the diabase,performed well data constraining-seismic mapping,and explored the spatial distribution and hydrocarbon accumulation regularity of the rock.Diabase has wholly crystalline porphyric-like texture with phenocrysts of plagioclase and clinopyroxene.The effective reservoir space in the rocks is mainly secondary dissolved pores and fractures.Diabase can be divided into two sub-facies:centrality and border.High-quality reservoirs are inclined to be distributed in border sub-facies.The rocks display themselves as smooth or slight sawtooth logs with high resistivity and low interval transit time,and seismic reflectance signatures of high amplitude,middle- to low-frequency and fine continuity of events.Vertically,the diabase was shown to be mainly distributed in the first and third members of the Shahejie Formation.The rock shows two kinds of original invasion occurrence,namely layer-parallel and translayer invasion and two types of later transformation,i.e.saucer-shaped and fault-block transformation.Distribution of the diabase was mainly controlled by the main strike-slip fault (Jiazhangsi fault and Jiadong fault) of two intrusive manners associated with faulting of unilateral and bilateral invasion.The invasion distance were measured to be 1 375 m to 5 625 m and averaged at 2 572 m and thickness of the intrusions was 49 m to 165 m (averaged 112 m).Generally,larger volume of diabase means larger thickness of overlying strata.The intrusive age of diabase is dated back to late Dongying period as the result of volcanic-hydrothermal effects.Secondary pores caused by fluid-rock interaction is suggested to be a critical factor for the formation of diabase reservoirs and “interface reservoirs” is proposed to be the main reservoiring pattern of the rock.

Key words: diabase, hydrocarbon accumulation pattern, igneous reservoir, Oligocene, Liaohe Basin

CLC Number:

TE122.3

Sun Ang, Huang Yulong, Li Jun, Feng Yuhui, Wang Jianfei, Wang Pujun. Oligocene diabase of Eastern Sag in Liaohe Basin,NE China: characteristics,identification and hydrocarbon accumulation[J]. Oil & Gas Geology, 2016, 37(3): 372-380.

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Oligocene diabase of Eastern Sag in Liaohe Basin,NE China: characteristics,identification and hydrocarbon accumulation

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